Assertion :If the current in a solenoid is reversed in direction while keeping the same magnitude, the magnetic field energy stored in the solenoid decreases. Reason: Magnetic field energy density is proportional to square of current.

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 D Assertion is incorrect but Reason is correct
Reversing the direction of the current reverses the direction of the magnetic field.
However, it has no effect on the magnetic-field energy density, which is proportional to the square of the magnitude of the magnetic field.

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Assertion :If the current in a solenoid is reversed in direction while keeping the same magnitude, the magnetic field energy stored in the solenoid decreases. Reason: Magnetic field energy density is proportional to square of current.

The correct option is D Assertion is incorrect but Reason is correctReversing the direction of the current reverses the direction of the magnetic field. However, it has no effect on the magnetic-field energy density, which is proportional to the square of the magnitude of the magnetic field.

The correct option is D Assertion is incorrect but Reason is correct
Reversing the direction of the current reverses the direction of the magnetic field.
However, it has no effect on the magnetic-field energy density, which is proportional to the square of the magnitude of the magnetic field.