A simple pendulum of length l is pulled aside to make an angle `theta` with the vertical. Find the magnitude of the torque of the weight w of the bob about the point of suspension. When is the torque zero?

Answer

A, B

Explanation

A simple pendulum of length l is suspended from a rigid support. A bob of weight W is hanging on the other point. When the bob is at an angle `theta` wilth the vertical then total torque acting on the point of suspension.
`tau=Fxxr`
`rarr tau=omegarsintheta=omegalsintheta` As the lowest point of suspension the torque will be zero the force acting on the body passes through the point of suspension