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Q.

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

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a

both inside and outside the rod

b

neither inside nor outside the rod

c

only outside the rod

d

only inside the rod

answer is C.

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Detailed Solution

In a metallic rod, charge carriers flow through whole of the cross-section, the magnetic field exists both inside as well as outside.

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