Question 1

An inductor with inductance L and a resistor with resistance R are wired in series to an ideal battery with emf  .A switch in the circuit is closed at time t = 0, at which time the current is zero.A long time after the switch is thrown the potential differences across the inductor and resistor are:

Accepted Answer

A)  0, 
B)    , 0
C)    /2, /2
D)  (L/R)   , (R/L) 
E)  unknown since the rate of change of the current is not given

Question 2

A copper penny slides on a horizontal frictionless table.There is a square region of constant uniform magnetic field perpendicular to the table, as shown.Which graph correctly shows the speed v of the penny as a function of time t?

Accepted Answer

A)  I
B)  II
C)  III
D)  IV
E)  V

Question 3

Two coils have a mutual inductance of 3.5 mH.If the current in one coil is changing at a rate of 4.8 A/s, what is the emf induced in the second coil?

Accepted Answer

A)  7.3 x 10-4 V
B)  0.017 V
C)  1400 V
D)  cannot tell without knowing the inductance of the second coil
E)  cannot tell without knowing the current in the second coil

Question 4

One hundred turns of insulated copper wire are wrapped around an iron core of cross-sectional area 0.100 m2.The circuit is completed by connecting the coil to a 10- Ω\OmegaΩ  resistor.As the magnetic field along the coil axis changes from 1.00 T in one direction to 1.00 T in the other direction, the total charge that flows through the resistor is:

Accepted Answer

A)  0.01 C
B)  0.02 C
C)  0.2 C
D)  1 C
E)  2 C

Question 5

A car travels northward at 75 km/h along a straight road in a region where Earth's magnetic field has a vertical component of 0.50 * 10-4 T.The emf induced between the left and right side, separated by 1.7 m, is:

Accepted Answer

A)  0 V
B)  1.8 mV
C)  3.6 mV
D)  6.4 mV
E)  23 mV

Question 6

A 2.0 T uniform magnetic field makes an angle of 30 °  with the z axis.The magnetic flux through a 3.0 m2 portion of the xy plane is:

Accepted Answer

A)  2.0 Wb
B)  3.0 Wb
C)  5.2 Wb
D)  6.0 Wb
E)  12 Wb

Question 7

An inductance L, resistance R, and ideal battery of emf -Lt/R)  B) (   /R) e-Lt/R C) (   /R) (1 + e-Rt/L)  D) (   /R) e-Rt/L E) (   /R) (1 - e-Rt/L) " class="answers-bank-image d-inline" rel="preload" > are wired in series and the circuit is allowed to come to equilibrium.A switch in the circuit is opened at time t = 0, at which time the current is -Lt/R)  B) (   /R) e-Lt/R C) (   /R) (1 + e-Rt/L)  D) (   /R) e-Rt/L E) (   /R) (1 - e-Rt/L) " class="answers-bank-image d-inline" rel="preload" > /R.At any later time t the current i is given by:

Accepted Answer

A)  ( -Lt/R)  
B)  (   /R) e-Lt/R 
C)  (   /R) (1 + e-Rt/L)  
D)  (   /R) e-Rt/L 
E)  (   /R) (1 - e-Rt/L) " class="answers-bank-image d-inline" rel="preload" > /R) (1 - e-Lt/R) 
B)  ( -Lt/R)  
B)  (   /R) e-Lt/R 
C)  (   /R) (1 + e-Rt/L)  
D)  (   /R) e-Rt/L 
E)  (   /R) (1 - e-Rt/L) " class="answers-bank-image d-inline" rel="preload" > /R) e-Lt/R
C)  ( -Lt/R)  
B)  (   /R) e-Lt/R 
C)  (   /R) (1 + e-Rt/L)  
D)  (   /R) e-Rt/L 
E)  (   /R) (1 - e-Rt/L) " class="answers-bank-image d-inline" rel="preload" > /R) (1 + e-Rt/L) 
D)  ( -Lt/R)  
B)  (   /R) e-Lt/R 
C)  (   /R) (1 + e-Rt/L)  
D)  (   /R) e-Rt/L 
E)  (   /R) (1 - e-Rt/L) " class="answers-bank-image d-inline" rel="preload" > /R) e-Rt/L
E)  ( -Lt/R)  
B)  (   /R) e-Lt/R 
C)  (   /R) (1 + e-Rt/L)  
D)  (   /R) e-Rt/L 
E)  (   /R) (1 - e-Rt/L) " class="answers-bank-image d-inline" rel="preload" > /R) (1 - e-Rt/L)

Question 8

The diagrams show three circuits with identical batteries, identical inductors, and identical resistors.Rank them according to the current through the battery just after the switch is closed, from least to greatest.

Accepted Answer

A)  3, 2, 1
B)  2 and 3 tie, then 1
C)  1, 3, 2
D)  1, 2, 3
E)  2, 3, 1

Question 9

A changing magnetic field pierces the interior of a circuit containing three identical resistors.Two voltmeters are connected as shown.V1 reads 1 mV across R.V2 reads the voltage across the other two resistors, which is: 1 reads 1 mV across R.V2 reads the voltage across the other two resistors, which is:   A) 0 V B) 1/3 mV C) 1/2 mV D) 1 mV E) 2 mV" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  0 V
B)  1/3 mV
C)  1/2 mV
D)  1 mV
E)  2 mV

Question 10

A merry-go-round has an area of 300 m2 and spins at 2 rpm about a vertical axis at a place where the Earth's magnetic field is vertical and has a magnitude of 5 * 10-5 T.The emf around the rim is:

Accepted Answer

A)  0 V
B)  0.5 mV
C)  3.1 mV
D)  15 mV
E)  190 mV

Question 11

In the circuit shown, there will be a non-zero reading in galvanometer G:

Accepted Answer

A)  only just after S is closed
B)  only just after S is opened
C)  only while S is kept closed
D)  never
E)  only just after S is opened or closed

Question 12

A flat coil of wire, having 5 turns, has an inductance L.The inductance of a similar coil having 20 turns is:

Accepted Answer

A)  4L
B)  L/4
C)  16L
D)  L/16
E)  L

Question 13

A 3.5 mH inductor and a 4.5 mH inductor are connected in parallel.The equivalent inductance is:

Accepted Answer

A)  0.13 mH
B)  0.51 mH
C)  1.0 mH
D)  2.0 mH
E)  8.0 mH

Question 14

Coils P and Q each have a large number of turns of insulated wire.When switch S is closed, the pointer of galvanometer G is deflected toward the left.Now that S is closed, to make the pointer of G deflect toward the right one could:

Accepted Answer

A)  move the slide of the rheostat R quickly to the right
B)  move coil P toward coil Q
C)  move coil Q toward coil P
D)  open S
E)  do none of the above

Question 15

As an externally generated magnetic field through a certain conducting loop increases in magnitude, the field produced at points inside the loop by the current induced in the loop must be:

Accepted Answer

A)  increasing in magnitude
B)  decreasing in magnitude
C)  in the same direction as the applied field
D)  directed opposite to the applied field
E)  perpendicular to the applied field

Question 16

In the experiment shown:

Accepted Answer

A)  there is a steady reading in G as long as S is closed
B)  a motional emf is generated when S is closed
C)  the current in the battery goes through G
D)  there is a current in G just after S is opened or closed
E)  since the two loops are not connected, the current in G is always zero

Question 17

The figure shows a bar moving to the right on two conducting rails.To make an induced current i in the direction indicated, a constant magnetic field between the rails should be in what direction?

Accepted Answer

A)  Right
B)  Left
C)  Into the page
D)  Out of the page
E)  Impossible, cannot be done with a constant magnetic field

Question 18

As a loop of wire with a resistance of 10  Ω\OmegaΩ  moves in a non-uniform magnetic field, it loses kinetic energy at a uniform rate of 5 mJ/s.The induced emf in the loop is:

Accepted Answer

A)  0 V
B)  0.22 V
C)  0.28 V
D)  2.0 V
E)  cannot be calculated from the given data

Question 19

The diagram shows a circular loop of wire that rotates at a steady rate about a diameter O that is perpendicular to a uniform magnetic field.The maximum induced emf occurs when the point X on the loop passes:

Accepted Answer

A)  a
B)  b
C)  c
D)  d
E)  e

Question 20

A rectangular loop of wire has area A.It is placed perpendicular to a uniform magnetic field B and then spun around one of its sides at frequency f.The maximum induced emf is:

Accepted Answer

A)  BAf/2?
B)  BAf
C)  2BAf
D)  2 π\piπ BAf
E)  4 π\piπ BAf

Exam 30: Induction and Inductance

A changing magnetic field pierces the interior of a circuit containing three identical resistors.Two voltmeters are connected as shown.V₁ reads 1 mV across R.V₂ reads the voltage across the other two resistors, which is:

Correct Answer
verified

A 3.5 mH inductor and a 4.5 mH inductor are connected in parallel.The equivalent inductance is:

Correct Answer
verified

In the experiment shown:

Correct Answer
verified

A merry-go-round has an area of 300 m² and spins at 2 rpm about a vertical axis at a place where the Earth's magnetic field is vertical and has a magnitude of 5 * 10^-5 T.The emf around the rim is:

Correct Answer
verified

A flat coil of wire, having 5 turns, has an inductance L.The inductance of a similar coil having 20 turns is:

Correct Answer
verified

The figure shows a bar moving to the right on two conducting rails.To make an induced current i in the direction indicated, a constant magnetic field between the rails should be in what direction?

Correct Answer
verified

An inductance L, resistance R, and ideal battery of emf are wired in series and the circuit is allowed to come to equilibrium.A switch in the circuit is opened at time t = 0, at which time the current is /R.At any later time t the current i is given by:

Correct Answer
verified

A 2.0 T uniform magnetic field makes an angle of 30 ° with the z axis.The magnetic flux through a 3.0 m² portion of the xy plane is:

Correct Answer
verified

A copper penny slides on a horizontal frictionless table.There is a square region of constant uniform magnetic field perpendicular to the table, as shown.Which graph correctly shows the speed v of the penny as a function of time t?

Correct Answer
verified

As a loop of wire with a resistance of 10 $\Omega$ moves in a non-uniform magnetic field, it loses kinetic energy at a uniform rate of 5 mJ/s.The induced emf in the loop is:

Correct Answer
verified

The diagram shows a circular loop of wire that rotates at a steady rate about a diameter O that is perpendicular to a uniform magnetic field.The maximum induced emf occurs when the point X on the loop passes:

Correct Answer
verified

An inductor with inductance L and a resistor with resistance R are wired in series to an ideal battery with emf .A switch in the circuit is closed at time t = 0, at which time the current is zero.A long time after the switch is thrown the potential differences across the inductor and resistor are:

Correct Answer
verified

The diagrams show three circuits with identical batteries, identical inductors, and identical resistors.Rank them according to the current through the battery just after the switch is closed, from least to greatest.

Correct Answer
verified

Coils P and Q each have a large number of turns of insulated wire.When switch S is closed, the pointer of galvanometer G is deflected toward the left.Now that S is closed, to make the pointer of G deflect toward the right one could:

Correct Answer
verified

As an externally generated magnetic field through a certain conducting loop increases in magnitude, the field produced at points inside the loop by the current induced in the loop must be:

Correct Answer
verified

Correct Answer
verified

A rectangular loop of wire has area A.It is placed perpendicular to a uniform magnetic field B and then spun around one of its sides at frequency f.The maximum induced emf is:

Correct Answer
verified

A car travels northward at 75 km/h along a straight road in a region where Earth's magnetic field has a vertical component of 0.50 * 10^-4 T.The emf induced between the left and right side, separated by 1.7 m, is:

Correct Answer
verified

Two coils have a mutual inductance of 3.5 mH.If the current in one coil is changing at a rate of 4.8 A/s, what is the emf induced in the second coil?

Correct Answer
verified

In the circuit shown, there will be a non-zero reading in galvanometer G:

Correct Answer
verified

Exam 30: Induction and Inductance

A changing magnetic field pierces the interior of a circuit containing three identical resistors.Two voltmeters are connected as shown.V1 reads 1 mV across R.V2 reads the voltage across the other two resistors, which is:

Correct AnswerverifiedShow Answer

A 3.5 mH inductor and a 4.5 mH inductor are connected in parallel.The equivalent inductance is:

Correct AnswerverifiedShow Answer

In the experiment shown:

Correct AnswerverifiedShow Answer

A merry-go-round has an area of 300 m2 and spins at 2 rpm about a vertical axis at a place where the Earth's magnetic field is vertical and has a magnitude of 5 * 10-5 T.The emf around the rim is:

Correct AnswerverifiedShow Answer

A flat coil of wire, having 5 turns, has an inductance L.The inductance of a similar coil having 20 turns is:

Correct AnswerverifiedShow Answer

The figure shows a bar moving to the right on two conducting rails.To make an induced current i in the direction indicated, a constant magnetic field between the rails should be in what direction?

Correct AnswerverifiedShow Answer

An inductance L, resistance R, and ideal battery of emf are wired in series and the circuit is allowed to come to equilibrium.A switch in the circuit is opened at time t = 0, at which time the current is /R.At any later time t the current i is given by:

Correct AnswerverifiedShow Answer

A 2.0 T uniform magnetic field makes an angle of 30 ° with the z axis.The magnetic flux through a 3.0 m2 portion of the xy plane is:

Correct AnswerverifiedShow Answer

A copper penny slides on a horizontal frictionless table.There is a square region of constant uniform magnetic field perpendicular to the table, as shown.Which graph correctly shows the speed v of the penny as a function of time t?

Correct AnswerverifiedShow Answer

As a loop of wire with a resistance of 10 Ω\OmegaΩ moves in a non-uniform magnetic field, it loses kinetic energy at a uniform rate of 5 mJ/s.The induced emf in the loop is:

Correct AnswerverifiedShow Answer

The diagram shows a circular loop of wire that rotates at a steady rate about a diameter O that is perpendicular to a uniform magnetic field.The maximum induced emf occurs when the point X on the loop passes:

Correct AnswerverifiedShow Answer

An inductor with inductance L and a resistor with resistance R are wired in series to an ideal battery with emf .A switch in the circuit is closed at time t = 0, at which time the current is zero.A long time after the switch is thrown the potential differences across the inductor and resistor are:

Correct AnswerverifiedShow Answer

The diagrams show three circuits with identical batteries, identical inductors, and identical resistors.Rank them according to the current through the battery just after the switch is closed, from least to greatest.

Correct AnswerverifiedShow Answer

Coils P and Q each have a large number of turns of insulated wire.When switch S is closed, the pointer of galvanometer G is deflected toward the left.Now that S is closed, to make the pointer of G deflect toward the right one could:

Correct AnswerverifiedShow Answer

As an externally generated magnetic field through a certain conducting loop increases in magnitude, the field produced at points inside the loop by the current induced in the loop must be:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A rectangular loop of wire has area A.It is placed perpendicular to a uniform magnetic field B and then spun around one of its sides at frequency f.The maximum induced emf is:

Correct AnswerverifiedShow Answer

A car travels northward at 75 km/h along a straight road in a region where Earth's magnetic field has a vertical component of 0.50 * 10-4 T.The emf induced between the left and right side, separated by 1.7 m, is:

Correct AnswerverifiedShow Answer

Two coils have a mutual inductance of 3.5 mH.If the current in one coil is changing at a rate of 4.8 A/s, what is the emf induced in the second coil?

Correct AnswerverifiedShow Answer

In the circuit shown, there will be a non-zero reading in galvanometer G:

Correct AnswerverifiedShow Answer

A changing magnetic field pierces the interior of a circuit containing three identical resistors.Two voltmeters are connected as shown.V₁ reads 1 mV across R.V₂ reads the voltage across the other two resistors, which is:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A merry-go-round has an area of 300 m² and spins at 2 rpm about a vertical axis at a place where the Earth's magnetic field is vertical and has a magnitude of 5 * 10^-5 T.The emf around the rim is:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A 2.0 T uniform magnetic field makes an angle of 30 ° with the z axis.The magnetic flux through a 3.0 m² portion of the xy plane is:

Correct Answer
verified

Correct Answer
verified

As a loop of wire with a resistance of 10 $\Omega$ moves in a non-uniform magnetic field, it loses kinetic energy at a uniform rate of 5 mJ/s.The induced emf in the loop is:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A car travels northward at 75 km/h along a straight road in a region where Earth's magnetic field has a vertical component of 0.50 * 10^-4 T.The emf induced between the left and right side, separated by 1.7 m, is:

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified