A rectangular loop of wire is placed midway between two long straight parallel conductors as shown. The conductors carry currents i1 and i2 as indicated. If i1 is increasing and i2 is constant, then the induced current in the loop is:

A) zero B) clockwise C) counterclockwise D) depends on i1 - i2 E) depends on i1 + i2 A) zero B) clockwise C) counterclockwise D) depends on i1 - i2 E) depends on i1 + i2

A uniform magnetic field makes an angle of 30 $\degree$with the z axis. If the magnetic flux through a 1.0 m2 portion of the xy plane is 5.0 Wb then the magnetic flux through a 2.0 m2 portion of the same plane is:

A) 2.5 Wb B) 4.3 Wb C) 5.0 Wb D) 5.8 Wb E) 10 Wb A) 2.5 Wb B) 4.3 Wb C) 5.0 Wb D) 5.8 Wb E) 10 Wb

Exam 30: Induction and Inductance

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An inductance L and a resistance R are connected in series to an ideal battery. A switch in the circuit is closed at time t = 0, at which time the current is zero. The energy stored in the inductor is a maximum:

(Multiple Choice)

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Question 21

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:

(Multiple Choice)

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Question 22

A rectangular loop of wire is placed midway between two long straight parallel conductors as shown. The conductors carry currents i₁ and i₂ as indicated. If i₁ is increasing and i₂ is constant, then the induced current in the loop is:

(Multiple Choice)

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Question 23

If the magnetic flux through a certain region is changing with time:

(Multiple Choice)

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Question 24

The four wire loops shown have edge lengths of either L, 2L, or 3L. They will move with the same speed into a region of uniform magnetic field directed out of the page. Rank them according to the maximum magnitude of the induced emf, least to greatest.

(Multiple Choice)

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Question 25

At a particular instant of time the total magnetic flux through a stationary conducting loop is less in magnitude than the flux associated with an externally applied field. This might occur because:

(Multiple Choice)

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Question 26

A long narrow solenoid has length ℓ and a total of N turns, each of which has cross-sectional area A. Its inductance is:

(Multiple Choice)

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Question 27

The magnetic flux Φ_B through a surface:

(Multiple Choice)

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Question 28

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

(Multiple Choice)

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Question 29

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:

(Multiple Choice)

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Question 30

A cylindrical region of radius R contains a uniform magnetic field parallel to its axis. The field is zero outside the cylinder. If the magnitude of the field is changing at the rate dB/dt, the electric field induced at a point 2R from the cylinder axis is:

(Multiple Choice)

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Question 31

In the diagram, assume that all the magnetic field lines generated by coil 1 pass through coil 2. Coil 1 has 100 turns and coil 2 has 400 turns. Then:

(Multiple Choice)

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Question 32

A uniform magnetic field makes an angle of 30 $\degree$ with the z axis. If the magnetic flux through a 1.0 m² portion of the xy plane is 5.0 Wb then the magnetic flux through a 2.0 m² portion of the same plane is:

(Multiple Choice)

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Question 33

An 8.0-mH inductor and a 2.0- $\Omega$ resistor are wired in series to an ideal battery. A switch in the circuit is closed at time t = 0, at which time the current is zero. The current reaches half its final value at a time of:

(Multiple Choice)

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Question 34

In each of the following operations, energy is expended. The LEAST percentage of returnable electrical energy will be yielded by:

(Multiple Choice)

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Question 35

A 6.0 mH inductor is in a series circuit with a resistor and an ideal battery. At the instant the current in the circuit is 5.0 A the energy stored in the inductor is:

(Multiple Choice)

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Question 36

You push a permanent magnet with its north pole away from you toward a loop of conducting wire in front of you. Before the north pole enters the loop the current in the loop is:

(Multiple Choice)

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Question 37

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 current i is given by:

(Multiple Choice)

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Question 38

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.

(Multiple Choice)

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Question 39

A 10-turn ideal solenoid has an inductance of 4.0 mH. To generate an emf of 2.0 V the current should change at a rate of:

(Multiple Choice)

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Question 40

Showing 21 - 40 of 90

Exam 30: Induction and Inductance

An inductance L and a resistance R are connected in series to an ideal battery. A switch in the circuit is closed at time t = 0, at which time the current is zero. The energy stored in the inductor is a maximum:

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:

A rectangular loop of wire is placed midway between two long straight parallel conductors as shown. The conductors carry currents i1 and i2 as indicated. If i1 is increasing and i2 is constant, then the induced current in the loop is:

If the magnetic flux through a certain region is changing with time:

The four wire loops shown have edge lengths of either L, 2L, or 3L. They will move with the same speed into a region of uniform magnetic field directed out of the page. Rank them according to the maximum magnitude of the induced emf, least to greatest.

At a particular instant of time the total magnetic flux through a stationary conducting loop is less in magnitude than the flux associated with an externally applied field. This might occur because:

A long narrow solenoid has length ℓ and a total of N turns, each of which has cross-sectional area A. Its inductance is:

The magnetic flux ΦB through a surface:

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

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:

A cylindrical region of radius R contains a uniform magnetic field parallel to its axis. The field is zero outside the cylinder. If the magnitude of the field is changing at the rate dB/dt, the electric field induced at a point 2R from the cylinder axis is:

In the diagram, assume that all the magnetic field lines generated by coil 1 pass through coil 2. Coil 1 has 100 turns and coil 2 has 400 turns. Then:

A uniform magnetic field makes an angle of 30 °\degree° with the z axis. If the magnetic flux through a 1.0 m2 portion of the xy plane is 5.0 Wb then the magnetic flux through a 2.0 m2 portion of the same plane is:

An 8.0-mH inductor and a 2.0- Ω\OmegaΩ resistor are wired in series to an ideal battery. A switch in the circuit is closed at time t = 0, at which time the current is zero. The current reaches half its final value at a time of:

In each of the following operations, energy is expended. The LEAST percentage of returnable electrical energy will be yielded by:

A 6.0 mH inductor is in a series circuit with a resistor and an ideal battery. At the instant the current in the circuit is 5.0 A the energy stored in the inductor is:

You push a permanent magnet with its north pole away from you toward a loop of conducting wire in front of you. Before the north pole enters the loop the current in the loop is:

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 current i is given by:

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.

A 10-turn ideal solenoid has an inductance of 4.0 mH. To generate an emf of 2.0 V the current should change at a rate of:

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A rectangular loop of wire is placed midway between two long straight parallel conductors as shown. The conductors carry currents i₁ and i₂ as indicated. If i₁ is increasing and i₂ is constant, then the induced current in the loop is:

The magnetic flux Φ_B through a surface:

A uniform magnetic field makes an angle of 30 $\degree$ with the z axis. If the magnetic flux through a 1.0 m² portion of the xy plane is 5.0 Wb then the magnetic flux through a 2.0 m² portion of the same plane is:

An 8.0-mH inductor and a 2.0- $\Omega$ resistor are wired in series to an ideal battery. A switch in the circuit is closed at time t = 0, at which time the current is zero. The current reaches half its final value at a time of: