A total charge of 5µC is distributed uniformly on the surface of the thin walled semispherical cup. If the electric field strength at the centre of the hemisphere is 9×10⁸NC⁻¹, then the radius of the cup is
{1/4πε₀=9×10⁹N-m²C⁻²}

Options

(a) 5mm
(b) 10mm
(c) 5cm
(d) 10cm

Correct Answer:

5mm

Explanation:

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