A coil having 200 turns has a surface area of 0.15 m 2 . A magnetic field applied perpendicular to the coil changes from 0 . 2 T to 0 . 6 T in 0 . 4 s , then the induced emf [ in V ] is

Question

A coil having 200 turns has a surface area of 0.15 m 2 . A magnetic field applied perpendicular to the coil changes from 0 . 2 T to 0 . 6 T in 0 . 4 s , then the induced emf [ in V ] is, 45, 30, 15, 60

MARKS App · Accepted Answer

ϕ = n × A × B Where n ≡ No. of turns A ≡ Area of loop B ≡ Magnetic field ∴ ε = Δ ϕ Δ t = n A Δ B Δ t = 200 × 0.15 × 0.6 - 0.2 0.4 = 30 V

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