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JEE · NEET Previous Year Question

$An electrostatic paint sprayer has a metal sphere of diameter 18 cm and at a potential of 25 kV . The charge on the metal sphere is$

Topic: JEE PYQ

Answer: A. Full step-by-step solution below.

A $0.25 μC$
B $2.5 μC$
C $0.5 μC$
D $25 μC$

Correct answer: A

Solution

(a) As, V = \frac{kq}{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^{- 9} C = 0.25 μ C

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