Assertion :Consider a current carrying wire whose cross section area decreases gradually along the direction of current, like as shown in figure. As one goes from cross-section $A$ to cross-section $B$ , the drift speed of electron increases. Reason: Electric field intensity at any cross-section in a current carrying wire is in inversely proportional to its cross sectional area.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Both, the drift speed of electron as well as the electric field intensity is inversely proportional to the area i.e. both decrease as we go from smaller to larger area and vice-versa. But both of them are not related. Moreover, drift speed will be present in any conductor which carries a current. But, the electric field is proportional to the resistance of the wire which is the property of a conductor.

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