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A planar coil having 15turns carries ...

A planar coil having 15turns carries 20 A current . The coil is oriented with respect to the uniform magnetic field `B = 0.5 T` such that its direction area is `A = - 0.04hatim^(2)`. The potential energy of the coil in the given orientation is

A

`0`

B

`+ 0.72`

C

`6J`

D

`-1.44 J`

Text Solution

Verified by Experts

The correct Answer is:
C
Here, B=0.5t,l=20T,l=20A, N=12,A=-0.04`hatim^(2)`
Magnetic moment of the coil,
M=NIA
`(15)(20A)"("-0.04hatim^(2)")"=-12hatiAm^(*2)`
The potential energy of the coil in the given orientation is `U=-M.B-"("012hatiAm^(2)")"."("0.5hatiT")"=+6J`
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