A straight wilre of diameter 0.5 mm carr...

A straight wilre of diameter `0.5 mm` carrying a current `2A` is replaced by another wire of diameter `1 mm` carrying the same current. The strength of magnetic field at a distance `2 m` away from the centre is

half of the previous value

twice of the previous value

unchanged

quarter of its previous value

Text Solution

Verified by Experts

The correct Answer is:

`B=mu_0/(2pi) i/r` independent of diameter of wire

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