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Q.

If magnitude of two vectors are equal and magnitude of their resultant is also equal to one of them, then the angle (in degree) between the two vectors is :

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answer is 120.

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Detailed Solution

Consider three vectors R→ ,P→ and Q→

R2=P2+Q2+2PQcosθ, here R=P=Q

We get cosθ=-12⇒θ=120o

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