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A physicist works in a laboratory where ...

A physicist works in a laboratory where the magnetic field is `2T`. She wears a necklace enclosing area `0.01 m^(2)` in such a way that the plane of the necklace is normal to the field and is having a resistance `R=0.01Omega`. Because of power failure, the field decays to `1T` in time `10^(-3)` seconds.
The what is the total heat produced in her necklace?`(T=tesla)`

A

10 J

B

20 J

C

30 J

D

40 J

Text Solution

Verified by Experts

The correct Answer is:
A
`H=(e^(2)t)/R`
`e=|(N(B_(2)-B_(1))Acostheta)/t|=|(1xx(1-2)xx0.01)/10^(-3)|=10V`
`thereforeH=((10)^(2)xx10^(-3))/0.01=10J`.
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