A disk of radius R with uniform positive charge density a is placed on the xy plane with its centre at the origin. The Coulomb potential along the z-axis is
A particle of positive charge q is placed initially at rest at a point on the z axis with z = z 0 and z 0 > 0. In addition to the Coulomb force, the particle experiences a vertical force 
with c> 0. Let 
. Which of the following statements(s) is (are) correct?
and 
, the particle reaches the origin.
and 
the particle reaches the origin.
and 
, the particle returns back to z=z 0 .
> 1 and z 0 > 0, the particle always reaches the origin.
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
(a,c,d)
(Given)
…(1)
For equilibrium at 
c from equation (1)
Z>1.13R: F 2 >F 1 Particle reaches origin
Z<1.13R; F 1 >F 2 Particle reaches back to z=Z 0
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