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A rod can rotate in a horizontal plane a...

A rod can rotate in a horizontal plane about its one end. A bead which can move along the rod is placed at certain distance from the axis or rotation. The bead does not to friction. The rod has a constant angular acceleration

A

the normal reaction on the bead will be constant h magnitude and direction both

B

the magnitude of the normal reaction on the bead will be variable

C

the magnitude of friction force on the bead will be constant

D

the magnitude of friction force on the bead will be variable

Text Solution

Verified by Experts

The correct Answer is:
D
due to `alpha, omega` is increasing
to overcome centripetal force `m omega^(2) r` the friction force will be variable
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