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If    and   then a vector in the direction of and having magnitude as is 

Answer (Detailed Solution Below)

Option 4 :
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Detailed Solution

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Concept:

Vector  of magnitude |p| in the direction of  is given by

​If   then magnitude of ​ is written as​​

Calculation:

Let the required vector is 

A vector in the direction a and magnitude |b| is given by

Hence, option 4 is correct.

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