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The angle between vector Q r and the resultant of ) P 2 Q 2 ( r r + and ) P 2 – Q 2 ( r r is :

1. 0°
2. tan –1 P 2 Q 2 ) P 2 – Q 2 ( r r r r +
3. tan –1         Q P
4.       P Q 2 tan 1 –

Correct answer: 0°

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