Question

A charge q is distributed uniformly on a ring of radius r. A sphere of equal radius r is constructed with its centre at the periphery of the ring (see Fig.). The electric flux through the surface of the sphere is –

• A. $\frac{q}{\varepsilon_{0}}$
• B. $\frac{2q}{\varepsilon_{0}}$
• C. $\frac{q}{2\varepsilon_{0}}$
• D. $\frac{q}{3\varepsilon_{0}}$

Answer 1

Answer: (D)

$\frac{q}{3\varepsilon_{0}}$

Answer 2

Angle at O, is 120⁰ \ $\frac { 1 } { 3 }$ part of ring is inside the sphere

\$\Sigma$q inside the sphere =