NEET Electromagnetic Induction — Set 19

Question 1

A conducting loop is stationary in a uniform magnetic field that increases in strength. The induced emf is generated by what field component?

Accepted Answer

A changing magnetic field induces an electric field (per Maxwell’s equations), which drives the emf in the stationary loop.

Question 2

A circular loop of radius 13 cm is deformed into a straight wire in a 0.18 T field in 0.6 s. What is the induced emf?

Accepted Answer

Initial flux: $ \Phi = B A = 0.18 \times \pi \times (0.13)^2 = 0.00956 \, \text{Wb} $. Final flux = 0. $ \varepsilon = \frac{\Delta \Phi}{\Delta t} = \frac{0.00956}{0.6} = 0.01593 \, \text{V} \approx 0.016 \, \text{V} $.

Question 3

A conducting rod moves perpendicular to a uniform magnetic field with constant velocity. What is true about the induced emf across its ends?

Accepted Answer

The induced emf ($ \varepsilon = B l v $) remains constant because the velocity, magnetic field, and rod length are constant, leading to a steady flux change rate.

NEET Physics: Electromagnetic Induction — Practice Set 19

Q1. A conducting loop is stationary in a uniform magnetic field that increases in strength. The induced emf is generated by what field component?

Q2. A circular loop of radius 13 cm is deformed into a straight wire in a 0.18 T field in 0.6 s. What is the induced emf?

Q3. A conducting rod moves perpendicular to a uniform magnetic field with constant velocity. What is true about the induced emf across its ends?

Q4. A conducting loop is compressed in a uniform magnetic field. The induced current flows to maintain what quantity against the compression?

Q5. A coil of self-inductance 1.2 H has its current increased from 2 A to 6 A in 0.4 s. What is the magnitude of the induced emf?

Q6. A square loop of side 16 cm rotates at 18 rad/s in a 0.2 T field. What is the maximum emf induced?

Q7. A rod rotates at 10 rad/s in a 0.5 T field. If the length from the axis to the tip is 0.6 m, what is the emf induced?

Q8. A coil with \( L = 0.5 \, \text{H} \) has its current increased from 0 to 6 A in 0.6 s. What is the energy stored?

Q9. A coil of 75 turns and area 0.05 m² is in a 0.12 T field that drops to zero in 0.25 s. What is the induced emf?

Q10. A coil of self-inductance 1.8 H has its current increased from 3 A to 7 A in 0.5 s. What is the magnitude of the induced emf?