Test SeriesFree PYQsExamsPricing

NEET 2026 Physics question

PhysicsElectrostatic Potential and CapacitanceNEET 2026

Consider a fixed uniformly charged insulating sphere with radius and total charge . A point charge () with mass is released from rest at a distance of from the centre of the charged sphere. When the point charge reaches the surface of the sphere, its speed is: ( is the permittivity of vacuum, neglect gravitational forces).

Answer: (3)

Solution

Outside a uniformly charged sphere the field is that of a point charge at the centre, so the attraction on is conservative and the potential is . Energy conservation: $Missing argument for \dfrac\dfrac12 = (Missing argument for \dfrac\dfrac1R - Missing argument for \dfrac\dfrac1{3R}) =

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-105020