Equal amount of charge is given to two spheres A and B of radii 2cm and 3cm respectively. The potential VA and VB:
Correct answer: B. VA > VB
- A. VA=VB
- B. VA > VB
- C. VA < VB
- D. Depends upon the material of the sphere
Explanation
For a sphere, the potential on its surface is V = kQ/r. Since both spheres have the same charge (Q), the potential is inversely proportional to the radius (r). The sphere with thesmaller radius (A) will have the higher potential.
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Electrostatics describes forces between charges through Coulomb's law, electric fields and field intensity, then uses electric potential to measure energy per unit charge. Capacitors store charge and electrical energy, with capacitance depending on geometry and dielectric material, not simply on the amount of charge present.
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