Charge $q$ is uniformly distributed over a thin half ring of radius $R$. The electric field at the centre of the ring is
Charge $q$ is uniformly distributed over a thin half ring of radius $R$. The electric field at the centre of the ring is
- A
$\frac{q}{{2{\pi ^2}{\varepsilon _0}{R^2}}}$
- B
$\frac{q}{{4{\pi ^2}{\varepsilon _0}{R^2}}}$
- C
$\frac{q}{{4\pi {\varepsilon _0}{R^2}}}$
- D
$\frac{q}{{2\pi {\varepsilon _0}{R^2}}}$
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