Assertion :Magnetic field lines always form closed loops. Reason: Moving charges or currents produce a magnetic field.

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 lines always form closed loops
Because there are no magnetic charges (monopoles). Electric field lines end on electric charges. Magnetic field lines have no objects on which they could end, so they must form loops.
Rest charges produce electric field, Moving charges produces Electric as well as Magnetic field, whereas Accelerating charge produces Electromagnetic wave.
Hence option B.

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