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The magnetic field at a distance r from ...

The magnetic field at a distance r from a long wire carryimg current I is 0.4 T. The magnetic field at a distance 2r is

A

0.2T

B

0.8T

C

0.1 T

D

1.6T

Text Solution

Verified by Experts

The correct Answer is:
A
As , `B = (mu_(0) i)/(2 pi r) rArr 0.4 = (mu_(0)l)/(2 pi r)`
`B = (mu_(0) i)/(2pi (2r)) = (1)/(2) (mu_(0) i)/(2 pi r) = (1)/(2) xx 0.4 = 0.2 T `
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