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A long straight wire of radius a carries...

A long straight wire of radius `a` carries a steady current `i`. The current is uniformly distributed across its cross section. The ratio of the magnetis field at `(a)//(2) and (2a)` is

A

`1//4`

B

4

C

1

D

`1//2`

Text Solution

Verified by Experts

The correct Answer is:
3
`B_(1)=(mu_(0))/(2pi)(ir_(1))/(R)B_(2)=(mu_(0))/(2pi)(i)/(r_(2))`
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