Electrostatic Potential and Capacitance - Result Question 13

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14. A hollow metal sphere of radius $10 cm$ is charged such that the potential on its surface is $80 V$. The potential at the centre of the sphere is [1994]

======= ####14. A hollow metal sphere of radius $10 cm$ is charged such that the potential on its surface is $80 V$. The potential at the centre of the sphere is [1994]

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(b) $80 V$

(c) $800 V$

(d) $8 V$

Topic 2: Electric Potential Energy & Work

Done in Carrying a Charge15. The potential energy of particle in a force field is $U=\frac{A}{r^{2}}-\frac{B}{r}$, where $A$ and $B$ are positive constants and $r$ is the distance of particle from the centre of the field. For stable equilibrium, the distance of the particle is :

(a) $B / 2 A$

(b) $2 A / B$

(c) $A / B$

(d) $B / A$

[2012]

Show Answer

Answer:

Correct Answer: 14. (b)

Solution:

  1. (b) Potential at the centre of the sphere = potential on the surface $=80 V$.