ElectrostaticsHard
Question
A charged particle having some mass is resting in equilibrium at a height H above the centre of a uniformly charged non-conducting horizontal of radius R. The force of gravity acts downwards.; The equilibrium of the particle will be stable :
Options
A.for all values of H
B.only if H > 
C.only if H <
D.only if H =
Solution
mg = q ×
The field due to ring on its will be maximum at H = ±
i.e., above that point qE force will decrease and resultant force becomes in downward direction (equilibrium position) and also in same way for below point.mg = q ×
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