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Two equal vector have a resultant equal ...

Two equal vector have a resultant equal to either of them, then the angle between them will be:

A

`60^(@)`

B

`120^(@)`0

C

`90^(@)`

D

`0^(@)`

Text Solution

Verified by Experts

The correct Answer is:
B
(b) We have R=A=B
`thereforeR^(2)=R^(2)+R^(2)+2R Rcos theta `
`thereforecos theta=-(1)/(2) `
`thereforetheta=120^(@)`
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