Assertion :nm is not same as mN. Reason: 1 nm $=$ 10 $^{- 9}$ m and 1mN $=$ 10 $^{- 3}$ N

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
We know that the prefix 'nano' is used for $10^{- 9}$ factor and 'milli' is used for $10^{- 3}$ factor.
Thus $1 n m = 10^{- 9} m$ and $1 m N = 10^{- 3} N$
Hence $n m$ is not same as $m N$ .
Hence option A is correct.

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