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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

0.08 cm

B

0.8 cm

C

8 cm

D

80 cm

Text Solution

Verified by Experts

The correct Answer is:
C
`r = (mu_0"ni")/(2B)`
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