Question
Two charges, each equal to q, are kept at x = −a and x = a on the x-axis. A particle of mass m and charge qo =-q/2 is placed at the origin. If charge qo is given a small displacement (y<< a) along the y-axis, the net force acting on the particle is proportional to
-
y
-
-y
-
1/y
-
-1/y
Solution
A.
y
Net force in negative y -direction,
Fnet = 2F cos θ
