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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

one quarter of the earlier value

B

No change

C

Twice the earlier value

D

One half of the earlier value

Text Solution

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The correct Answer is:
B
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AAKASH INSTITUTE ENGLISH-MOVING CHARGE AND MAGNESIUM-SECTION C
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