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Question

If ¯V=2^i+^j^k and ¯W=^i+3^k. If ¯U is a unit vector then the maximum value of the scalar triple product [¯U¯V¯W] is

A
6
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B
10+6
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C
59
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D
60
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Solution

The correct option is B 59
we have [¯U¯V¯W]=¯U(¯VׯW)
=¯U¯VׯWcosϕ

ϕ is the angle between ¯U and ¯VׯW

¯VׯWcosϕ¯V¯W

max. value of [¯U¯V¯W]=¯VׯW=59

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