Two identical spheres of mass are released from rest at the negative plate of a…
PHYSICS · Single correct · CBSE · Physics · Electrostatic Potential and Capacitance · Electrostatic Potential and Capacitance
Problem
Two identical spheres of mass m are released from rest at the negative plate of a parallel-plate capacitor and accelerate toward the positive plate through the same potential difference ΔV. Sphere A carries charge +q, and sphere B carries charge +2q. Ignore gravity and edge effects. Which statement describes the speeds of the spheres just before they reach the positive plate?
(a) Sphere B is faster; vB=2vA
(b) Both spheres reach the plate with the same speed, vB=vA
(c) Sphere B is faster by a factor of 2; vB=2vA
(d) Sphere A is faster than sphere B, vA>vB