Electrostatic Potential and Capacitance: RE-NEET 2026

Medium· Electrostatic Potential (Work Done to Move a Charge in Electrostatic Field)· +4 / −1

Consider a fixed uniformly charged insulating sphere with radius

R

and total charge

+Q

. A point charge

-q

(

q \ll Q

) with mass

m

is released from rest at a distance of

3R

from the centre of the charged sphere. When the point charge reaches the surface of the sphere, its speed is: (

\varepsilon_0

is the permittivity of vacuum, neglect gravitational forces).

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