Q.

A vector 2i^+2j^ rotated about its tail through an angle 450 in clockwise direction. Then the new vector is

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a

22j^

b

2j^

c

2i^

d

22i^

answer is D.

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Detailed Solution

Given vector is making 450 with x axis. After rotation of 450 in clockwise direction, it will become parallel to x axis  without change in its magnitude. So, new vector=22 i^
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A vector 2i^+2j^ rotated about its tail through an angle 450 in clockwise direction. Then the new vector is