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A straight wire of diametre 0.5 mm carry...

A straight wire of diametre 0.5 mm carrying a current of 1 A is replaced by another wire of 1mm diametre carrying same current. The strenth of magnetic field far away is

A

unchanged

B

quarter of its earlier value

C

half of the earlier value

D

twice the earlier value

Text Solution

Verified by Experts

The correct Answer is:
A
B is independent of the wire’s radius. So B remains constant.
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VMC MODULES ENGLISH-MAGNETIC EFFECTS OF CURRENT -LEVEL 1
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