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Find  if  and  is a unit vector ?

  3. 3
  4. None of these

Answer (Detailed Solution Below)

Option 2 :
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Detailed Solution

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CONCEPT:

  • If  is a unit vector then 

CALCULATION:

Given:  and  is a unit vector

⇒ 

As we know that, 

⇒ 

As we know that, if  is a unit vector then 

⇒ 

Hence, correct option is 2.

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