AIIMS 2017 Physics Solenoids Assertion Reason Question
In the following questions, a statement of assertion is given followed by a corresponding statement of reason. Assertion: The magnetic field at the end of very long current carrying solenoid is half of that at the center. Reason: The focal length of lens does not depends on color of light used.
If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true and reason is not correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The assertion is true because the magnetic field inside a long solenoid is uniform and maximum, while at the ends, it decreases, but it does not become exactly half; rather, it approaches zero outside the solenoid. The reason is also true but unrelated to the assertion, as the focal length of a lens indeed does not depend on the color of light, which does not explain the behavior of the magnetic field in the solenoid. Option A is incorrect because the reason does not explain the assertion, while options C and D are incorrect since both statements are true.
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