Question 1

A long straight wire is in the plane of a rectangular conducting loop.The straight wire carries an increasing current in the direction shown.The current in the loop is:

Accepted Answer

A)  zero
B)  clockwise
C)  counterclockwise
D)  clockwise in the left side and counterclockwise in the right side
E)  counterclockwise in the left side and clockwise in the right sideF) A) and C)
G) A) and E)

Question 2

The normal to a certain 1.0 m2 area makes an angle of 60  °\degree°  with a uniform magnetic field.The magnetic flux through this area is the same as the flux through a second area that is perpendicular to the field if the second area is:

Accepted Answer

A)  0.50 m2
B)  0.87 m2
C)  1.0 m2
D)  1.2 m2
E)  2.0 m2  F) A) and C)
G) B) and C)

Question 3

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

Accepted Answer

A)  the flux is zero
B)  the flux is a maximum
C)  the flux is half its maximum value
D)  the derivative of the flux with respect to time is zero
E)  none of the aboveF) All of the above
G) A) and E)

Question 4

A 10-turn ideal solenoid has an inductance of 3.5 mH.When the solenoid carries a current of 2.0 A the magnetic flux through each turn is:

Accepted Answer

A)  0 Wb
B)  3.5 * 10-4 Wb
C)  7.0 * 10-4 Wb
D)  7.0* 10-3 Wb
E)  7.0 *10-2 WbF) B) and D)
G) B) and C)

Question 5

An inductance L, resistance R, and ideal battery of emf are wired in series.A switch in the circuit is closed at time t = 0, at which time the current is zero.At any later time t the emf of the inductor is given by:

Accepted Answer

A)  (1 - e-Lt/R) 
B)  e-Lt/R
C)  (1 + e-Rt/L) 
D)  e-Rt/L
E)  (1 - e-Rt/L) F) A) and B)
G) B) and E)

Question 6

As a loop of wire with a resistance of 10  Ω\OmegaΩ  moves in a constant non-uniform magnetic field, it loses kinetic energy at a uniform rate of 5.0 mJ/s.The induced current in the loop is:

Accepted Answer

A)  0 A
B)  2.0 mA
C)  2.8 mA
D)  22 mA
E)  cannot be calculated from the given data F) A) and C)
G) C) and E)

Question 7

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 mVF) A) and E)
G) A) and C)

Question 8

A vertical bar magnet is dropped through the center of a horizontal loop of wire, with its north pole leading.At the instant when the midpoint of the magnet is in the plane of the loop, the induced current in the loop, viewed from above, is:

Accepted Answer

A)  maximum and clockwise
B)  maximum and counterclockwise
C)  not maximum but clockwise
D)  not maximum but counterclockwise
E)  essentially zeroF) A) and E)
G) A) and B)

Question 9

The units of motional emf are:

Accepted Answer

A)  volt/second
B)  volt.meter/second
C)  volt/tesla
D)  tesla/second
E)  tesla.meter2/secondF) A) and E)
G) A) and C)

Question 10

Suppose this page is perpendicular to a uniform magnetic field and the magnetic flux through it is 5.0 Wb.If the page is turned by 30  °\degree° around an edge the flux through it will be:

Accepted Answer

A)  2.5 Wb
B)  4.3 Wb
C)  5.0 Wb
D)  5.8 Wb
E)  10 Wb F) B) and E)
G) None of the above

Exam 30: Induction and Inductance

Suppose this page is perpendicular to a uniform magnetic field and the magnetic flux through it is 5.0 Wb.If the page is turned by 30 $\degree$ around an edge the flux through it will be:

Correct Answer
verified

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 long straight wire is in the plane of a rectangular conducting loop.The straight wire carries an increasing current in the direction shown.The current in the loop is:

Correct Answer
verified

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

Correct Answer
verified

An inductance L, resistance R, and ideal battery of emf are wired in series.A switch in the circuit is closed at time t = 0, at which time the current is zero.At any later time t the emf of the inductor is given by:

Correct Answer
verified

A vertical bar magnet is dropped through the center of a horizontal loop of wire, with its north pole leading.At the instant when the midpoint of the magnet is in the plane of the loop, the induced current in the loop, viewed from above, is:

Correct Answer
verified

The units of motional emf are:

Correct Answer
verified

The normal to a certain 1.0 m² area makes an angle of 60 $\degree$ with a uniform magnetic field.The magnetic flux through this area is the same as the flux through a second area that is perpendicular to the field if the second area is:

Correct Answer
verified

As a loop of wire with a resistance of 10 $\Omega$ moves in a constant non-uniform magnetic field, it loses kinetic energy at a uniform rate of 5.0 mJ/s.The induced current in the loop is:

Correct Answer
verified

A 10-turn ideal solenoid has an inductance of 3.5 mH.When the solenoid carries a current of 2.0 A the magnetic flux through each turn is:

Correct Answer
verified

Exam 30: Induction and Inductance

Suppose this page is perpendicular to a uniform magnetic field and the magnetic flux through it is 5.0 Wb.If the page is turned by 30 °\degree° around an edge the flux through it will be:

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 AnswerverifiedShow Answer

A long straight wire is in the plane of a rectangular conducting loop.The straight wire carries an increasing current in the direction shown.The current in the loop is:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An inductance L, resistance R, and ideal battery of emf are wired in series.A switch in the circuit is closed at time t = 0, at which time the current is zero.At any later time t the emf of the inductor is given by:

Correct AnswerverifiedShow Answer

A vertical bar magnet is dropped through the center of a horizontal loop of wire, with its north pole leading.At the instant when the midpoint of the magnet is in the plane of the loop, the induced current in the loop, viewed from above, is:

Correct AnswerverifiedShow Answer

The units of motional emf are:

Correct AnswerverifiedShow Answer

The normal to a certain 1.0 m2 area makes an angle of 60 °\degree° with a uniform magnetic field.The magnetic flux through this area is the same as the flux through a second area that is perpendicular to the field if the second area is:

Correct AnswerverifiedShow Answer

As a loop of wire with a resistance of 10 Ω\OmegaΩ moves in a constant non-uniform magnetic field, it loses kinetic energy at a uniform rate of 5.0 mJ/s.The induced current in the loop is:

Correct AnswerverifiedShow Answer

A 10-turn ideal solenoid has an inductance of 3.5 mH.When the solenoid carries a current of 2.0 A the magnetic flux through each turn is:

Correct AnswerverifiedShow Answer

Suppose this page is perpendicular to a uniform magnetic field and the magnetic flux through it is 5.0 Wb.If the page is turned by 30 $\degree$ around an edge the flux through it will be:

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The normal to a certain 1.0 m² area makes an angle of 60 $\degree$ with a uniform magnetic field.The magnetic flux through this area is the same as the flux through a second area that is perpendicular to the field if the second area is:

Correct Answer
verified

As a loop of wire with a resistance of 10 $\Omega$ moves in a constant non-uniform magnetic field, it loses kinetic energy at a uniform rate of 5.0 mJ/s.The induced current in the loop is:

Correct Answer
verified

Correct Answer
verified