Question Detail
Question
A coil of 50 turns with area 0.02 m² is in a uniform B-field of 0.3 T perpendicular to the coil. If the field is reduced to zero in 0.1 seconds, what is the average induced emf?
Correct Answer
Option A is the correct answer.
Detailed Explanation
Initial Φ = BA = (0.3)(0.02) = 0.006 Wb. ΔΦ = 0 - 0.006 = -0.006 Wb. |ε| = N|ΔΦ/Δt| = 50 × (0.006/0.1) = 50 × 0.06 = 3 V.
Hint
ε = N × (ΔΦ/Δt).