Two concentric thin metallic spheres of radii R1 and R2 (R1 > R2) bear charges Q1 and Q2 respectively. Then the potential at radius r between R1 and R2 will be 1/(4πε0) times:
Correct answer: B. Option B
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation
The calculation assumes the potential due to a charge on a conducting sphere at an external point is the same as that of a point charge at its center, and the potential inside a conducting sphere is constant and equal to the potential on its surface.
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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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