First slide
Faraday's law of Electromagnetic induction

A physicist works in a laboratory where the magnetic field is 4 T. She wears a necklace enclosing area 0.01 m2 in such a way that the plane of the necklace is normal to the field and is having a resistance R = 0.01 Ω. Because of power failure, the field decays to 1 T in time 103 seconds. Then what is the total heat produced in her necklace? (T = Tesla)


H=V2tR  ​and   V=N(B2B1)Acosθt


So,    H=(30)2×1030.01=90J

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