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A rectangular coil of single turn, having area A, rotates in a uniform magnetic field Ban angular velocity w about an axis is perpendicular to the field .If initially the plane of coil is perpendicular to the field,then the average induced e.m.f. when ithas rotated through 90 degree is???a.wBA/pieb. wBA/2 piec. wBA/4 pied.2wBA/ pie

Kevin Nash , 10 Years ago
Grade upto college level
anser 1 Answers
ROSHAN MUJEEB

Last Activity: 4 Years ago

initially flux,ϕ=BAcos0=BA
After rotating through an angle90o.
Flux through the coil is zero.
So,Δϕ=BA

Angular speed=w, so, time period=ω/2π​=T

4T​is time taken to rotate90o.

So,ΔtΔϕ​=T/4BA​=π2BAω​

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