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Question

The component of vector 3^i+4^j along vector ^i+^j is

A
12(^j+^i)
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B
32(^j+^i)
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C
52(^j+^i)
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D
72(^j+^i)
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Solution

The correct option is C 72(^j+^i)
Component of A along B is A.BB^B
Hence, it is (3^i+4^j).(^i+^j)2^i+^j2=72(^i+^j)

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