NEET Physics: Electromagnetic Induction — Practice Set 24

Q1. A solenoid with mutual inductance 0.25 H has a current change of 4 A/s in the primary coil. What is the induced emf in the secondary coil?

Q2. A coil of 300 turns rotates at 70 rad/s in a 0.07 T field. If the area is 0.012 m², what is the maximum emf?

Q3. A rod rotates at 15 rad/s in a 0.3 T field. If the length from the axis to the tip is 0.4 m, what is the emf induced?

Q4. A loop of 0.2 m × 0.1 m moves out of a 0.5 T field at 2 m/s along its longer side. How long does the emf last?

Q5. A wheel with 8 spokes of 0.55 m each rotates at 50 rpm in a 0.4 T field. What is the induced emf?

Q6. A coil of 170 turns and area 0.015 m² is rotated at 35 Hz in a 0.1 T field. What is the maximum emf?

Q7. A solenoid of 700 turns per meter and area 0.015 m² has a current drop from 8 A to 5 A in 0.3 s. What is the self-induced emf? (\( \mu_0 = 4\pi \times 10^{-7} \, \text{H/m} \))

Q8. A coil with high self-inductance is suddenly disconnected from a battery. The resulting high voltage spike is due to what?

Q9. A rectangular loop of 0.1 m × 0.2 m moves out of a 0.4 T field at 0.5 m/s along its shorter side. What is the emf?

Q10. A conducting loop is placed in a uniform magnetic field with its plane parallel to the field lines. Why is no emf induced when the field strength changes?

Physics — Electromagnetic Induction

Set 24 of 25

15:00

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A solenoid with mutual inductance 0.25 H has a current change of 4 A/s in the primary coil. What is the induced emf in the secondary coil?