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WorksheetsMagnetic Inductance _ Part 1
Total questions: 19
Worksheet time: 17mins
Which of the following are units for inductance?
I. Henry
II. Joules/(Ampere)2
III. Volt . second/Ampere
I only
II only
III only
I and II only
I, II and III
Energy can be stored in many ways. What is the
primary energy storage form of an inductor?
Kinetic
Electric field
Magnetic field
Gravitational field
Spring displacement
The potential at 𝑎 is higher than the potential at 𝑏.
The inductor current 𝐼 is from __________.
𝑎 to 𝑏 and steady
𝑎 to 𝑏 and decreasing
𝑏 to 𝑎 and steady
𝑏 to 𝑎 and increasing
𝑏 to 𝑎 and decreasing
How much energy is stored when 50 A flows
through a 20 H inductor?
500 J
10000 J
12500 J
25000 J
50000 J
A 5.6 mH inductor is connected to a current source.
What is the magnitude of the voltage in the inductor
at time 𝑡 = 4.0 𝑠 if the current is
𝐼(𝑡) = 10.0 + 9.0𝑡 −3.0𝑡^2?
11 mV
22 mV
84 mV
58 mV
185 mV
In the diagram shown, which current is changing
more rapidly?
Current 𝐼1
Current 𝐼2
Both are constant
Both are changing at the same rate
Both are zero
A 75 H inductor has s time-dependent current
flowing through it over a short period of time as
shown in the graph shown.
What is the magnitude of the emf induced by the
inductor at time 𝑡 = 0.3 𝑠?
7.5 V
22.5 V
67.5 V
150 V
175 V
How large a current must flow through a 1.2 H inductance so that the energy stored is 393 J?
1.17 A
2.31 A
25.6 A
44.2 A
107.1 A
In the circuit below, a fully charged capacitor with a
capacitance C = 60 μF and charge Q = 6 μC is
connected to an inductor L = 5 mH.
What is the current in the circuit at the instant
when the switch is closed?
0 A
2 A
6 A
10 A
30 A
In the circuit below, a fully charged capacitor with a
capacitance C = 60 μF and charge Q = 6 μC is
connected to an inductor L = 5 mH.
Which of the following is/are true for the circuit
above?
I. The capacitor stores energy in the electric field
II. The inductor stores energy in the magnetic field
III. There is a cyclic interchange of energy between capacitor and Inductor
I only
II only
III only
I and II only
I, II and III
In the circuit below, a fully charged capacitor with a
capacitance C = 60 μF and charge Q = 6 μC is
connected to an inductor L = 5 mH.
The frequency of oscillation of the charge in the
above circuit is ___.
0.003 Hz
0.29 Hz
3.4 Hz
290 Hz
912 Hz
In the circuit below, a fully charged capacitor with a
capacitance C = 60 μF and charge Q = 6 μC is
connected to an inductor L = 5 mH.
A student wishes to increase the frequency of the oscillator circuit above. Which of the following would accomplish this objective?
I. Increase L
II. Increase C
III. Decrease L
IV. Decrease C
Increase L only
Increase L or Increase C
Increase L or decrease C
Increase C or decrease L
Decrease L or decrease C
How much energy is stored in a long solenoid with 660 turns, length 𝐿 = 3.2 𝑚, and cross sectional area 𝐴 = 121 𝑐𝑚^2, when the current in it is 𝐼 = 85 𝐴?
1.10 𝑚𝐽
1.10 𝑘𝐽
9.1 1𝑘𝐽
5.21 𝑘𝐽
7.48 𝑘𝐽
A long narrow solenoid has length ℓ and a total of N turns, each of which has cross-sectional area A. Its inductance is:
μ0 N^2 Aℓ
μ0 N^2 A/ℓ
μ0 NA/ℓ
μ0 N^2 ℓ/A
none of these
A 7.2 mH inductor is connected to a current source. What is the magnitude of the voltage in the inductor at time 𝑡 = 3.0 𝑠 if the current is 𝐼(𝑡) = 5.0 + 7.0𝑡 − 2.0𝑡^2?
22 mV
36 mV
58 mV
90 mV
230 mV
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:
0 A/s
0.5 A/s
50 A/s
250 A/s
500 A/s
Which of the following has the largest inductance?
A solenoid of radius 1 cm, length 5 cm, and with 100 turns of wire per centimeter
A solenoid of radius 3 cm, length 1 cm, and with 100 turns of wire per centimeter
A solenoid of radius 2 cm, length 2 cm, and with 100 turns of wire per centimeter
A solenoid of radius 1 cm, length 1 cm, and with 200 turns of wire per centimeter
A solenoid of radius 2 cm, length 5 cm, and with 100 turns of wire per centimeter
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:
0 Wb
3.5 x 10^–4 Wb
7.0 x 10^–4 Wb
7.0 x 10^–3 Wb
7.0 x10^–2 Wb
The diagram shows an inductor that is part of a circuit. The direction of the emf induced in the inductor is indicated. Which of the following is possible?
The current is constant and rightward
The current is constant and leftward
The current is increasing and rightward
The current is increasing and leftward
None of the above
