Assertion :Magnetic force between two short magnets, when they are co-axial follows inverse square law of distance Reason: The magnetic forces between two poles do not follow inverse square law of distance.

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 D Both Assertion and Reason are incorrect
The magnetic force between the two short magnets do not follow the inverse square law.
The force between two short magnets is given by:
$F_{B} = \frac{B^{2}}{2 μ_{0}} A$

On the other hand, the magnetic force between the two follows inverse square law of distances.

So, assertion and reason both are incorrect.

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