AP EAMCET · PHYSICS · Electrostatics
A Van de Graaff generator has a spherical metal shell as an electrode which is at a potential \(15 \times 10^6 \mathrm{~V}\). If the dielectric strength of the surrounding medium is \(5 \times 10^7 \mathrm{Vm}^{-1}\), then the diameter of the shell is
- A 30 cm
- B 15 cm
- C 60 cm
- D 120 cm
Answer & Solution
Correct Answer
(C) 60 cm
Step-by-step Solution
Detailed explanation
Potential difference, \(V=15 \times 10^6 \mathrm{~V}\) Dielectric strength of medium \(=5 \times 10^7 \mathrm{~V} / \mathrm{m}\) Electric field intensity, \[ E=5 \times 10^7 \mathrm{~V} / \mathrm{m} \] Minimum radius of spherical shell required for the purpose is given by…
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