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A straight wire of diameter 0.4 mm carry...

A straight wire of diameter 0.4 mm carrying a current of 2A is replaced by another wire of 0.8 mm diameter and carrying the same current. The magnetic field at the same distance from the wire is

A

one half of the first value

B

twice the first value

C

not changed

D

thrice the first value

Text Solution

Verified by Experts

The correct Answer is:
C
`B=(mu_0)/(4pi)((2I)/r)` for same r, B depends upon I and not on the diameter.
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