Question

Radius of a metal sphere is 4 cm. It is given a
charge of 8 uC. The force acting on unit area
of its surface is
(A) 8.953 x 10' N/m²
(B) 8.953 x 103 N/m2
(C) 0.8953 x 10-2N/m?
(D) 89.53 × 10-N/m?​

Answer 1

Answer:

F=179.9 N

Explanation:

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to solve this question you need to know a concept know as radiation pressure.

F= q²/2εA²

here,

q=8ˣ$10^{-6}$

ε=8.85ˣ$10^{-12}$

A=4πr²=4π(4ₓ10⁻²)²=64π×10⁻⁴

substituting the values in the formula

we get F=179.9 N

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