AP EAMCET · PHYSICS · Electrostatics
An electrostatic paint sprayer has a metal sphere of diameter \(18 \mathrm{~cm}\) and at a potential of \(25 \mathrm{kV}\). The charge on the metal sphere is
- A \(0.25 \mu \mathrm{C}\)
- B \(2.5 \mu \mathrm{C}\)
- C \(0.5 \mu \mathrm{C}\)
- D \(25 \mu \mathrm{C}\)
Answer & Solution
Correct Answer
(A) \(0.25 \mu \mathrm{C}\)
Step-by-step Solution
Detailed explanation
As, \(V=\frac{k q}{r}\) So, \(q=\frac{V \times r}{k}=\frac{25 \times 10^3 \times 9 \times 10^{-2}}{9 \times 10^9}\) \(=25 \times 10^{-8} \mathrm{C}=0.25 \mu \mathrm{C}\)
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