NEET Physics: Electromagnetic Induction — Practice Set 3

Q1. A coil with \( L = 0.45 \, \text{H} \) has its current increased from 0 to 8 A in 0.8 s. What is the energy stored?

Q2. A conducting loop is moved into a uniform magnetic field region. During the entry, the induced current flows in a direction determined by what?

Q3. A loop of 0.25 m × 0.15 m moves out of a 0.2 T field at 1.5 m/s along its longer side. How long does the emf last?

Q4. Two coils are placed close to each other. When the current in one coil is changed, an emf is induced in the other. This phenomenon is known as what?

Q5. A coil of 110 turns experiences a magnetic flux change from 0 to 0.05 Wb in 0.1 s. What is the induced emf?

Q6. A circular loop of radius 18 cm is deformed into a straight wire in a 0.14 T field in 0.7 s. What is the induced emf?

Q7. A coil of 160 turns and area 0.025 m² is rotated at 20 Hz in a 0.09 T field. What is the maximum emf?

Q8. A rectangular loop of 0.2 m × 0.35 m moves out of a 0.4 T field at 0.8 m/s along its shorter side. What is the emf?

Q9. A rod of length 0.7 m moves at 2 m/s in a 0.3 T field perpendicular to its length. What is the induced emf?

Q10. A coil connected to a DC source shows a slow rise in current when switched on. This delay is primarily due to what effect?

Physics — Electromagnetic Induction

Set 3 of 25

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A coil with \( L = 0.45 \, \text{H} \) has its current increased from 0 to 8 A in 0.8 s. What is the energy stored?