Assertion :The force of gravitation between a sphere and a rod of mass $M_{2}$ is $= (G M_{1} M_{2}) / r$ . Reason: Newton's law of gravitational holds correct for point masses.

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 and Reason is correct

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Solution

The correct option is D Assertion is incorrect and Reason is correct
Assertion $F = \frac{G M_{1} M - 2}{r}$
Dimension of L.H.S $\neq$ R.H.S
$\Rightarrow$ Assertion is wrong
Also, $F$ cannot be $\frac{G M_{1} M_{2}}{r^{2}}$ Since Newton's law of only for point masses.
$∴$ Reason is correct.

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