Q.

If F1 and F2 are two vectors of equal magnitudes F such that I F1 . F2  I= IF1 X F2|, then IF1 + F2| equals to

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a

(2+2)F

b

2F

c

F2

d

None of these

answer is A.

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Detailed Solution

F·Fcosθ=F·Fsinθ or tanθ=1 or θ=45°F1+F2=F2+F2+2F·Fcos45°=(2+2)F
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