Question
Tue December 25, 2012 By: Mrinal
 

A circular coil of N turns and radius R is kept normal to a magnetic field given by B=BoCoswt. Deduce an expression for emf induced in this coil. State the rule which helps to detect the direction of induced current?

Expert Reply
Tue December 25, 2012

Area of the coil, A = ?r2

Magnetic field of the coil, B = Bocos?t

=> Magnetic flux linked with the coil, ? = NB.A

=> ? = NBA cos0

=> ? = NBA

Induced emf, e = - d?/dt = ?NABosin?t

Fleming’s right hand rule helps to detect the direction of induced current.

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