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A wire carrying a current of 4A is in th...

A wire carrying a current of `4A` is in the form of the circle. It is necessary to have a magnetic field of induction `pixx10^(-5)T` at the centre. The radius of the circle must be

A

`0.08cm`

B

`0.8cm`

C

`8 cm`

D

`80cm`

Text Solution

Verified by Experts

The correct Answer is:
3
`r=(mu_(0)ni)/(2B)`
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