Assertion :The magnetic field at the ends of a very long current carrying solenoid is half of that at the centre. Reason: If the solenoid is sufficiently long, the field within it is uniform.

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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Both Assertion and Reason are incorrect

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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
The magnetic field at the ends of a very long current carrying solenoid is half of that at the centre, that is. $B_{e n d} = \frac{1}{2} B_{i n}$ .
Also for a long solenoid, magnetic field is uniform within it but this reason is not explaining the assertion.

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