$A s s e r t i o n :$ Magnetic force between two short magnets, when they are co-axial follows inverse square law of distance.
$R e a s o n :$ The magnetic forces between two poles do not follow inverse square law of distance.

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Both $a s s e r t i o n$ and $r e a s o n$ are true but $r e a s o n$ is not the correct explanation of $a s s e r t i o n$ .

$A s s e r t i o n$ is true but $r e a s o n$ is false.

Both $a s s e r t i o n$ and $r e a s o n$ are false.

Both $a s s e r t i o n$ and $r e a s o n$ are true and $r e a s o n$ is the correct explanation of $a s s e r t i o n$ .

answer is B.

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Detailed Solution

Force between two Magnets is given by $F = \frac{μ_{0}}{4 π} \frac{6 M_{1} M_{2}}{r^{4}}, M_{1} a n d M_{2} a r e t h e m a g n e t i c m o m e n t s o f t h e m a g n e t s$ . This is a result using the concepts of potential energy of a magnet placed in a external magnetic field.

Force between two poles is given by $F = \frac{μ_{0}}{4 π} \frac{m_{1} m_{2}}{r^{2}}, m_{1} a n d m_{2} a r e t h e p o l e s t r e n g t h s$

It does not follow inverse square law of distance. The assertion and reason both are false.

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