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A circular coil having N turns and radiu...

A circular coil having `N` turns and radius `r` carries a current `L` it is held in the `XZ` plane in a magnetic field `Bhati`. The torque on the coil due to the magnetic field is:

A

`Bpir^2IN`

B

Zero

C

`(Br^2I)/(piN)`

D

`(Bpir^2I)/(N)`

Text Solution

Verified by Experts

The correct Answer is:
A
`bartau=barmxxbarB`
`barB=Bhati`
`m=[(pir^2)i]hatj`
`impliesbartau=-[Npir^2i.B]barRimplies|bartau|=pir^2NiB`
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