Magnetic flux linked with a coil (in Wb) varies as Φ = 5t² + 3t + 16. Magnitude of induced EMF at t = 4 s is:
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Question

Magnetic flux linked with a coil (in Wb) varies as Φ = 5t² + 3t + 16. Magnitude of induced EMF at t = 4 s is:

G1 Physics · Accepted Answer

Step 1: Faraday’s law for the flux linkage shown gives |ε| = |dΦ/dt|. Step 2: dΦ/dt = 10t + 3. Step 3: At t = 4 s, |ε| = 40 + 3 = 43 V, so option B. Final answer: (B) 43 V.