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Chapter 1 - Electric Current, Ohms Law and Kirchhoffs Laws

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Chapter 2 - Magnetic Effects of Electric Current and Measuring Instruments

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Chapter 3 - Electromagnetic Induction and AC Dynamo and Transformer

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Chapter 4 - Alternating Current AC Circuits

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Chapter 5 - Dual Nature of Wave and Particle

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Chapter 6 - Atomic Spectra and X-Rays

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Chapter 7 - Lasers and Principles

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Chapter 8 - Modern Electronics and Semiconductors

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Quiz

Lesson 2: Mutual Induction Between Two Coils and Self-Induction of a Single Coil — Picture questions (exam style)

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  • Questions count: 10
  • Passing grade: 60%
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1.
A secondary coil is wound round a primary solenoid. Secondary turns ×2, rate of change of primary current ×2, primary length ×2 (same turns). What is the new : old secondary emf?
A secondary coil is wound round a primary solenoid. Secondary turns ×2, rate of change of primary current ×2, primary length ×2 (same turns). What is the new : old secondary emf?
e₂′ : e₂ = 4 : 1
e₂′ : e₂ = 1 : 2
e₂′ : e₂ = 2 : 1
e₂′ : e₂ = 2 : 2
2.
A 0.1 H inductor carries 3 A. The current rises uniformly to 6 A in 0.05 s. Which option is correct?
A 0.1 H inductor carries 3 A. The current rises uniformly to 6 A in 0.05 s. Which option is correct?
energy becomes 8×, induced emf during the rise = 6 V
energy becomes 4×, induced emf during the rise = 12 V
energy becomes 4×, induced emf during the rise = 3 V
energy becomes 4×, induced emf during the rise = 6 V
3.
A secondary coil (200 turns) is wound round the middle of a long primary solenoid (100 turns, 25.0 cm long, area 4.00 cm2). The primary current changes by 1 A in 0.1 s. Find the secondary e.m.f.
A secondary coil (200 turns) is wound round the middle of a long primary solenoid (100 turns, 25.0 cm long, area 4.00 cm²). The primary current changes by 1 A in 0.1 s. Find the secondary e.m.f.
2.01×10−6 V
4.02×10−6 V
2.01×10−4 V
4.02×10−4 V
4.
Find the energy stored in the magnetic field of the 0.5 H inductor carrying 8 A.
Find the energy stored in the magnetic field of the 0.5 H inductor carrying 8 A.
2.00 J
16.0 J
4.00 J
32.0 J
5.
When the primary current changes as shown, an e.m.f. of 120 V is induced in the secondary. Find the mutual inductance.
When the primary current changes as shown, an e.m.f. of 120 V is induced in the secondary. Find the mutual inductance.
0.100 H
0.0100 H
1.44×105 H
100 H
6.
When the primary current changes as shown, an e.m.f. of 100 V is induced in the secondary. Find the mutual inductance.
When the primary current changes as shown, an e.m.f. of 100 V is induced in the secondary. Find the mutual inductance.
0.250 H
40000 H
4.00×10−3 H
250 H
7.
A 0.2 H inductor carries 1 A. The current rises uniformly to 3 A in 0.05 s. Which option is correct?
A 0.2 H inductor carries 1 A. The current rises uniformly to 3 A in 0.05 s. Which option is correct?
energy becomes 6×, induced emf during the rise = 4 V
energy becomes 9×, induced emf during the rise = 8 V
energy becomes 9×, induced emf during the rise = 4 V
energy becomes 3×, induced emf during the rise = 4 V
8.
A secondary coil is wound round a primary solenoid. Secondary turns ×3, rate of change of primary current ×1, primary length ×1 (same turns). What is the new : old secondary emf?
A secondary coil is wound round a primary solenoid. Secondary turns ×3, rate of change of primary current ×1, primary length ×1 (same turns). What is the new : old secondary emf?
e₂′ : e₂ = 1 : 3
e₂′ : e₂ = 6 : 1
e₂′ : e₂ = 3 : 1
e₂′ : e₂ = 9 : 1
9.
A 0.1 H inductor carries 1 A. The current rises uniformly to 3 A in 0.02 s. Which option is correct?
A 0.1 H inductor carries 1 A. The current rises uniformly to 3 A in 0.02 s. Which option is correct?
energy becomes 6×, induced emf during the rise = 15 V
energy becomes 6×, induced emf during the rise = 5 V
energy becomes 3×, induced emf during the rise = 10 V
energy becomes 9×, induced emf during the rise = 10 V
10.
When the primary current changes as shown, an e.m.f. of 75.0 V is induced in the secondary. Find the mutual inductance.
When the primary current changes as shown, an e.m.f. of 75.0 V is induced in the secondary. Find the mutual inductance.
22500 H
0.250 H
4.00×10−3 H
250 H
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