Faraday’s Law NEET Questions

Physics - Electromagnetic Induction and Alternating Currents

Faraday’s Law MCQ Questions


7.
A coil has 500 turns and the magnetic flux linked with each turn changes from 4 × 10⁻⁴ Wb to 1 × 10⁻⁴ Wb in 0.2 s. The induced emf is:
A.
1.5 V
B.
15 V
C.
0.75 V
D.
7.5 V
😑 View Answer Rough Work Error
ANSWER :
C. 0.75 V
8.
The magnetic flux through a coil perpendicular to its plane varies as Φ = (5t³ + 4t² + 2t - 5) Wb. The induced emf at t = 2 s is:
A.
-78 V
B.
-66 V
C.
66 V
D.
108 V
😑 View Answer Rough Work Error
ANSWER :
A. -78 V
9.
A circular coil of radius 10 cm and 100 turns is placed in a magnetic field which changes at the rate of 0.02 T/s perpendicular to the plane of the coil. The induced emf is:
A.
6.28 × 10⁻³ V
B.
3.14 × 10⁻² V
C.
3.14 × 10⁻³ V
D.
6.28 × 10⁻² V
😑 View Answer Rough Work Error
ANSWER :
D. 6.28 × 10⁻² V
10.
A square loop of side 10 cm and resistance 0.5 Ω is placed vertically in the east-west plane. A uniform magnetic field of 0.10 T is set up across the plane in the north-east direction. The magnetic field is decreased to zero in 0.70 s at a steady rate. The induced current is approximately:
A.
1 mA
B.
2 mA
C.
10 mA
D.
5 mA
😑 View Answer Rough Work Error
ANSWER :
B. 2 mA
11.
If the number of turns in a coil is doubled keeping all other factors constant, the induced emf in the coil will be:
A.
Quadrupled
B.
Unchanged
C.
Halved
D.
Doubled
😑 View Answer Rough Work Error
ANSWER :
D. Doubled
12.
A coil of 1000 turns and area 500 cm² carries a magnetic flux density of 2 × 10⁻⁵ Wb/m². If the magnetic field reverses its direction in 0.1 s, the average induced emf is:
A.
0.1 V
B.
0.05 V
C.
0.02 V
D.
0.01 V
😑 View Answer Rough Work Error
ANSWER :
C. 0.02 V