A coil has 200 turns and area of 70 cm 2 . The magnetic field perpendicular to the plane of the coil is 0.3 Wb m - 2 and takes 0.1 s to rotate through 180 ° . The value of the induced E.M.F. will be

Question

A coil has 200 turns and area of 70 cm 2 . The magnetic field perpendicular to the plane of the coil is 0.3 Wb m - 2 and takes 0.1 s to rotate through 180 ° . The value of the induced E.M.F. will be, 8.4 V, 84 V, 42 V, 4.2 V

MARKS App · Accepted Answer

Induced E M F is, E = - N Δ ϕ Δ t E = - N B A cos ⁡ θ 2 - cos ⁡ θ 1 Δ t E = - N B A cos ⁡ 1 80 o - cos o ⁡ 0 Δ t E = 2 N B A t E = 2 200 0.3 70 × 1 0 - 4 0.1 E = 8.4 V

Search any question & find its solution

Looking for more such questions to practice?