Q.

If a copper wire carries a direct current, the magnetic field associated with the current will be

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a

both inside & outside the wire

b

only inside the wire

c

neither inside nor outside the wire

d

only outside the wire

answer is B.

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Detailed Solution

The magnetic field never lies inside a conductor like electric field. It takes place outside around current carrying conductor.

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If a copper wire carries a direct current, the magnetic field associated with the current will be