A circular ring of radius with uniform positive charge density per unit length is…

PHYSICS · Subjective · CBSE · Physics · Electrostatic Potential and Capacitance · Electrostatic Potential and Capacitance

Problem

A circular ring of radius

R

with uniform positive charge density

\lambda

per unit length is located in the

y

z

plane with its centre at the origin

O

. A particle of mass

m

and positive charge

q

is projected from the point

P (R\sqrt{3}, 0, 0)

on the positive

x

-axis directly towards

O

, with an initial speed

v

. Find the smallest (non-zero) value of the speed

v

such that the particle does not return to

P