Question 1

An electric field is associated with every:

Accepted Answer

A)  magnetic field 
B)  time-dependent magnetic field 
C)  time-dependent magnetic flux 
D)  object moving in a magnetic field 
E)  conductor moving in a magnetic field 
A)  magnetic field 
B)  time-dependent magnetic field 
C)  time-dependent magnetic flux 
D)  object moving in a magnetic field 
E)  conductor moving in a magnetic field

Question 2

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 mJ/s. The induced current in the loop:

Accepted Answer

A)  is 0 
B)  is 2 mA 
C)  is 2.8 mA 
D)  is 20 mA 
E)  cannot be calculated from the given data 
A)  is 0 
B)  is 2 mA 
C)  is 2.8 mA 
D)  is 20 mA 
E)  cannot be calculated from the given data

Question 3

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?:

Accepted Answer

A)  zero 
B)  140 T/s, decreasing 
C)  140 T/s, increasing 
D)  420 T/s, decreasing 
E)  420 T/s, increasing 
A)  zero 
B)  140 T/s, decreasing 
C)  140 T/s, increasing 
D)  420 T/s, decreasing 
E)  420 T/s, increasing

Question 4

Immediately after switch S in the circuit shown is closed, the current through the battery is:

Accepted Answer

A)  0 
B)  V0/R1 
C)  V0/R2 
D)  V0/(R1 + R2) 
E)  V0(R1 + R2)/(R1R2) 
A)  0 
B)  V0/R1 
C)  V0/R2 
D)  V0/(R1 + R2) 
E)  V0(R1 + R2)/(R1R2)

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 0, at which time the current is zero. At any later time t the potential difference across the resistor is given by:

Accepted Answer

A)  $\varepsilon$(1 - e-Lt/R) 
B)  $\varepsilon$e-Lt/R 
C)  $\varepsilon$(1 + e-Rt/L) 
D)  $\varepsilon$e-Rt/L 
E)  $\varepsilon$(1 - e-Rt/L) 
A)  $\varepsilon$(1 - e-Lt/R) 
B)  $\varepsilon$e-Lt/R 
C)  $\varepsilon$(1 + e-Rt/L) 
D)  $\varepsilon$e-Rt/L 
E)  $\varepsilon$(1 - e-Rt/L)

Exam 30: Induction and Inductance

An electric field is associated with every:

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 mJ/s. The induced current in the loop:

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?:

Immediately after switch S in the circuit shown is closed, the current through the battery is:

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

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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 mJ/s. The induced current in the loop: