Question

two vectors of equal magnitude a have a resultant equal to either of them then the angle between them will be a30^. b 120 degree c 60 degree and 150 degree​

Answer 1

Answer:

60°

Explanation:

as the magnitude of resultant is same so let it be v....

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then...by vetor law of addition...

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R square = A square + B square + 2 AB cos theta

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ATQ.

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v square = v2 + v2 + 2v2cos theta

v2 = 2v square + 2v square cos theta

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then by solving...

v2 = -2v square cos theta...

so... cos theta = ½ i.e . cos 60° .....

so theta = 60°