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Question

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

A
1
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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 C 59
[UVW]=U(V×W)
=U.[(2^i+^j^k)×(^i+3^k)]
=U.(3^i7^j^k)
The maximum value of a.b is ab.
So, similarly, the maximum value of the above expression will be 59

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