The magnitude of the cross product $|\vec{a}\times\vec{b}|$ equals:
A$|\vec a|+|\vec b|$
B$|\vec a||\vec b|$
C$|\vec a||\vec b|\sin\theta$
D$|\vec a||\vec b|\cos\theta$
Answer & Solution
Correct answer: C. $|\vec a||\vec b|\sin\theta$
The cross-product magnitude is |a×b| = |a||b|sinθ.
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