Assertion :Magnetic field due to current carrying solenoid is independent of its length and cross-sectional area. Reason: The magnetic field inside the solenoid 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
Magnetic' field due to a solenoid having $n$ number of turns per metre and carrying current $I$ is $B = μ_{0} n I$ which, is independent of the length and area of cross-section of the solenoid.
The magnetic field inside the solenoid is uniform.

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