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If  &  then the unit vector along the  is

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Answer (Detailed Solution Below)

Option 4 :
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Detailed Solution

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Concept:

The unit vector in the direction of vector  is given by .

Calculation:

Given:  & 

⇒  = 

Unit vector in the direction of vector  

⇒ 

⇒  

⇒  

Hence, option 4 is correct.

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