Assertion :A direct current flows through a metallic rod. It produces magnetic field only outside the rod. Reason: The charge carries flow through whole of the cross section.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
Magnetic field exists both inside and outside the rod since the current is evenly distributed on the x-section of the wire along the length of the wire.
A circular ampere's loop will enclose current whether it is inside or outside the wire.

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