Physics · Electrostatics
An insulating solid sphere of radius R has a uniform positive charge density ρ. Which of the following statements is NOT true?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1When a charge q is taken from the centre to the surface of the sphere, its potential energy changes by qρ / 3ε0.✓
- 2When a charge q is taken from the centre to the surface of the sphere, its potential energy changes by -ρqR2 / 6ε0.
- 3The electric field at a distance r (r > R) from the centre of the sphere is ρR3 / 3ε0r2.
- 4The electric field at a distance r (r < R) from the centre of the sphere is ρr / 3ε0.
Correct answer
When a charge q is taken from the centre to the surface of the sphere, its potential energy changes by qρ / 3ε0.
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