A simple pendulum rotates in a horizontal plane with an angular velocity of ω about a fixed point P in gravity-free space. There is a negative charge at P. The bob gradually emits photo electrons (disregard the energy and momentum of the incident photons and emitted electrons). The total force acting on the bob is T.
(a) T will decrease, ω will decrease.
(b) T will decrease, ω will remain constant.
(c) T and ω will remain unchanged.
(d) The elastic strain in the string will decrease.