Faraday’s Law NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

Faraday’s Law MCQ Questions


13.
A circular coil of radius 10 cm, 500 turns and resistance 2 Ω is placed with its plane perpendicular to the horizontal component of earth's magnetic field (3.0 × 10⁻⁵ T). It is rotated through 180° about its vertical diameter in 0.25 s. The induced emf is approximately:
A.
3.8 × 10⁻³ V
B.
9.5 × 10⁻⁴ V
C.
1.9 × 10⁻³ V
D.
7.6 × 10⁻³ V
😑 View Answer Rough Work Error
ANSWER :
A. 3.8 × 10⁻³ V
14.
When a coil is rotated in a uniform magnetic field, the induced emf is maximum when the plane of the coil is:
A.
Parallel to the field
B.
At 45° to the field
C.
Perpendicular to the field
D.
Making any angle with the field
😑 View Answer Rough Work Error
ANSWER :
A. Parallel to the field
15.
A coil rotating in a magnetic field produces an induced emf given by ε = 200 sin(100πt) V. The frequency of rotation of the coil is:
A.
50 Hz
B.
200 Hz
C.
25 Hz
D.
100 Hz
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ANSWER :
A. 50 Hz
16.
The magnetic flux through a coil can be changed by:
A.
Changing the angle between B and area vector only
B.
Changing the area A only
C.
Changing any of B, A, or θ
D.
Changing the magnitude of B only
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ANSWER :
C. Changing any of B, A, or θ
17.
In Faraday's experiment, pressing the tapping key in the primary circuit induces emf in the secondary circuit because:
A.
Both coils are at rest
B.
Current in primary changes from zero to maximum value in short time
C.
Current in primary is constant
D.
There is no magnetic field
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ANSWER :
B. Current in primary changes from zero to maximum value in short time
18.
If an open circuit is used in Faraday's experiment instead of a closed loop:
A.
Only current flows without emf
B.
No emf is induced
C.
Emf is induced but no current flows
D.
Both emf and current are induced
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ANSWER :
C. Emf is induced but no current flows