The capacitance of an insulated conducting sphere of radius R in vacuum is 2p?0R

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Question
The capacitance of an insulated conducting sphere of radius R in vacuum is
Options
A. 2p?₀R
B. 4p?₀R
C. 4p?₀R²
D. 4p

Correct Answer

4p?₀R

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1. If m, v, r are the mass, velocity and radius of orbit of electron and h is Planck's constant, quantum condition for electron's orbit is
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A.
B.
C.
D.

2. The electric dipole moment of a neutral system of point charges Q₁, Q₂.... is Q_ir_i . The charges Q_i
Options
A. must be all positive
B. must be all negative
C. must be such that Q_i = 0
D. either (a) or (b)

5. For a multiplate capacitor having n plates, A as area of each plate, the capacitance is proportional to
Options
A. n A
B. (n - 1) A
C. (n + 1) A
D.

9. In terms of classical representation of electrons
Options
A. an atom is essentially empty
B. an atom is essentially full
C. an atom may be essentially empty or full depending on the material
D. an atom may be essentially empty or full depending on temperature

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