lf a→ is a non-zero vector of modulus a and m is a non-zero scalar then ma→ unit vector if

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m=±1

a=|m|

a=1/|m|

a=1/m

answer is C.

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Detailed Solution

ma→ is a unit vector if and only if |ma→|=1⇒|m||a→|=1⇒|m|a=1⇒a=1|m|

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