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Questions  

What is the angle between P and the resultant of (P + Q) and (P - Q)? 

a
Zero
b
tan-1(P/Q)
c
tan-1(Q/P)
d
tan-1(P-Q) / (P+Q)

detailed solution

Correct option is A

Resultant of (P+ Q) and (P - Q) is P + Q + P - Q or 2Pwhich is parallel to P.So, angle between P and 2P will be zero.

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