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Question

During rotation of a body, the position vector is along X axis and force vector is along Y axis. The direction of torque vector is

A
in the X-Y plane
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B
Along negative Z-axis
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C
Along positive Z-axis
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D
in the X-Z plane
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Solution

The correct option is C Along positive Z-axis
T=(r×F)
=(r^i)×(F^j)
This yields the direction of the cross product along the unit vector ^k
direction of the torque is along the positive zaxis as per the right hand thumb rule.

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