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Q.

Given that A + B + C = 0. Two out of the three vectors are equal in magnitude. The magnitude of the third vector is 2, times that of the either out of the other two. Which of the following can be angle between these vectors ?

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a

45°,48°, 90°

b

45°, 90°, 135°

c

90°, 135°, 135°

d

30°, 60°, 90°

answer is C.

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Detailed Solution

Let A=B and C = 2A.Hence, A2 +B2 =C2∴ Angle between A and B is 90°From figure angle between B and C is 135° and anglebetween C and A is also 135°.
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