Q.

The vectors A and B are such that lA+Bl=lA-Bl then the angle between the two vectors will be

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a

0°

b

60°

c

90°

d

180°

answer is C.

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Detailed Solution

Given that lA+Bl=lA-BI∴ A2 + B2 + 2A Bcos θ = A2 + B2 -2 ABcos θor 4ABcosθ=0 or cosθ=0,θ = 90°
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The vectors A and B are such that lA+Bl=lA-Bl then the angle between the two vectors will be