A uniform magnetic field makes an angle of 30$\degree$ with the z axis. If the magnetic flux through a 1-m2 portion of the xy plane is 5 Wb then the magnetic flux through a 2-m2 portion of the same plane is:

A) 2.5 Wb B) 4.3 Wb C) 5 Wb D) 5.8 Wb E) 10 Wb A) 2.5 Wb B) 4.3 Wb C) 5 Wb D) 5.8 Wb E) 10 Wb

Exam 30: Induction and Inductance

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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:

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Question 41

A cylindrical region of radius R contains a uniform magnetic field, parallel to its axis, with magnitude that is changing linearly with time. If r is the radial distance from the cylinder axis, the magnitude of the induced electric field outside the cylinder is proportional to:

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Question 42

A 10 turn conducting loop with a radius of 3.0 cm spins at 60 revolutions per second in a magnetic field of 0.50 T. The maximum emf generated is:

(Multiple Choice)

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Question 43

When the switch S in the circuit shown is closed, the time constant for the growth of current in R₂ is:

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Question 44

A cylindrical region of radius R = 3.0 cm contains a uniform magnetic field parallel to its axis. If the electric field induced at a point R/2 from the cylinder axis 4.5 *10^-3 v/m the magitude of the magnetic field must be changing at the rate:

(Multiple Choice)

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Question 45

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:

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Question 46

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:

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Question 47

A uniform magnetic field makes an angle of 30 $\degree$ with the z axis. If the magnetic flux through a 1-m² portion of the xy plane is 5 Wb then the magnetic flux through a 2-m² portion of the same plane is:

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Question 48

The stored energy in an inductor:

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Question 49

A cylindrical region of radius R contains a uniform magnetic field, parallel to its axis, with magnitude that is changing linearly with time. If r is the radial distance from the cylinder axis, the magnitude of the induced electric field inside the cylinder is proportional to:

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Question 50

A 6.0 mH inductor is in a circuit. At the instant the current is 5.0 A and its rate of change is 200 A/s, the rate with which the energy stored in the inductor is increasing is:

(Multiple Choice)

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Question 51

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

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Question 52

The circuit shown is in a uniform magnetic field that is into the page. The current in the circuit is 0.20 A. At what rate is the magnitude of the magnetic field changing: Is it increasing or decreasing?:

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Question 53

A rod with resistance R lies across frictionless conducting rails in a constant uniform magnetic field B, as shown. Assume the rails have negligible resistance. The magnitude of the force that must be applied by a person to pull the rod to the right at constant speed v is:

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Question 54

Faraday's law states that an induced emf is proportional to:

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Question 55

An 8.0-mH inductor and a 2.0-(\Omega\) resistor are wired in series to a 20-V ideal battery. A switch in the circuit is closed at time 0, at which time the current is zero. After a long time the current in the resistor and the current in the inductor are:

(Multiple Choice)

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Question 56

A 6.0-mH inductor and a 3.0- $\Omega$ resistor are wired in series to a 12-V ideal battery. A switch in the circuit is closed at time 0, at which time the current is zero. 2.0 ms later the energy stored in the inductor is:

(Multiple Choice)

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Question 57

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:

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Question 58

An electric field is associated with every:

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Question 59

The units of motional emf are:

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Question 60

Showing 41 - 60 of 85

Exam 30: Induction and Inductance

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:

A cylindrical region of radius R contains a uniform magnetic field, parallel to its axis, with magnitude that is changing linearly with time. If r is the radial distance from the cylinder axis, the magnitude of the induced electric field outside the cylinder is proportional to:

A 10 turn conducting loop with a radius of 3.0 cm spins at 60 revolutions per second in a magnetic field of 0.50 T. The maximum emf generated is:

When the switch S in the circuit shown is closed, the time constant for the growth of current in R2 is:

A cylindrical region of radius R = 3.0 cm contains a uniform magnetic field parallel to its axis. If the electric field induced at a point R/2 from the cylinder axis 4.5 *10-3 v/m the magitude of the magnetic field must be changing at the rate:

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:

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-m2 portion of the xy plane is 5 Wb then the magnetic flux through a 2-m2 portion of the same plane is:

The stored energy in an inductor:

A cylindrical region of radius R contains a uniform magnetic field, parallel to its axis, with magnitude that is changing linearly with time. If r is the radial distance from the cylinder axis, the magnitude of the induced electric field inside the cylinder is proportional to:

A 6.0 mH inductor is in a circuit. At the instant the current is 5.0 A and its rate of change is 200 A/s, the rate with which the energy stored in the inductor is increasing is:

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

The circuit shown is in a uniform magnetic field that is into the page. The current in the circuit is 0.20 A. At what rate is the magnitude of the magnetic field changing: Is it increasing or decreasing?:

A rod with resistance R lies across frictionless conducting rails in a constant uniform magnetic field B, as shown. Assume the rails have negligible resistance. The magnitude of the force that must be applied by a person to pull the rod to the right at constant speed v is:

Faraday's law states that an induced emf is proportional to:

An 8.0-mH inductor and a 2.0-(\Omega\) resistor are wired in series to a 20-V ideal battery. A switch in the circuit is closed at time 0, at which time the current is zero. After a long time the current in the resistor and the current in the inductor are:

A 6.0-mH inductor and a 3.0- Ω\OmegaΩ resistor are wired in series to a 12-V ideal battery. A switch in the circuit is closed at time 0, at which time the current is zero. 2.0 ms later the energy stored in the inductor is:

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:

An electric field is associated with every:

The units of motional emf are:

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When the switch S in the circuit shown is closed, the time constant for the growth of current in R₂ is:

A cylindrical region of radius R = 3.0 cm contains a uniform magnetic field parallel to its axis. If the electric field induced at a point R/2 from the cylinder axis 4.5 *10^-3 v/m the magitude of the magnetic field must be changing at the rate:

A uniform magnetic field makes an angle of 30 $\degree$ with the z axis. If the magnetic flux through a 1-m² portion of the xy plane is 5 Wb then the magnetic flux through a 2-m² portion of the same plane is:

A 6.0-mH inductor and a 3.0- $\Omega$ resistor are wired in series to a 12-V ideal battery. A switch in the circuit is closed at time 0, at which time the current is zero. 2.0 ms later the energy stored in the inductor is: