Question

The tension in the string revolving in a vertical circle with a mass m at the end which is at the lowest position

(a) mv²/r

(b) mv²/r - mg

(c) mv²/r + mg

(d) mg

Answer 1

Correct Option  (c) mv²/r + mg

Explanation:

Tension = Centrifugal force + weight = (c) mv²/r + mg

Answer 2

Correct Option is  (c) mv²/r + mg

As in vertical circular motion, suppose you are rotating a string in a vertical circular path, If you leave the string the string will move outward that means centrifugal force is acting on it. 

The weight of the body at the lowest position will be mg in the same direction of Centrifugal force. The tension will oppose both forces.

so T = Centrifugal force + weight = (c) mv2/r + mg