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Question

Unit vector parallel to the resultant of vectors A=4^i3^jandB=8^i+8^j will be

A
24^i+5^j13
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B
12^i+5^j13
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C
6^i+5^j13
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D
None of these
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Solution

The correct option is B 12^i+5^j13
Resultant is given as:
A+B=4^i3^j+8^i+8^j=12^i+5^j
Thus unit vector is given as: 12^i+5^j122+52
which gives, 12^i+5^j13

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