First slide

Vectors

Question

What.is the angle between P and the cross product of (P + Q) and (P $-$ Q)?

Moderate

A

90⁰
B

tan^-1 (P/Q)
C

tan^-1 (Q/P)
D

0⁰

Solution

Cross product of (P + Q) and (P $-$ Q) is perpendicular to the plane formed by (P + Q) and (P $-$ Q) or P (or Q).

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