Question

84. The force F = (î+bj+3K)N is rotated through an
angle a , then it becomes 2i +(26 – 1)j + k}N.
The value of b is :-
2
(2) -
(1) 2
3
(3)
2
3
(4) Both (1) and (2)
why magnitude of vector on rotating will be same???
anyone answer........​

Answer 1

Answer:

Sorry I don't know the answer

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