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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

0.2 Tesla

B

0.8 Tesla

C

0.1 Tesla

D

1.6 Tesla

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The correct Answer is:
A
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ERRORLESS -MAGNETIC EFFECT OF CURRENT-Exercise
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