A semi-circular arc of radius ‘a’ is charged uniformly and the charge per unit lengths is λ. The electric field at the centre is

• $\frac{\mathrm{\lambda }}{4{\mathrm{\pi \epsilon }}_0\mathrm{a}}$
• $\frac{{\mathrm{\lambda }}^2}{2{\mathrm{\pi \epsilon }}_0\mathrm{a}}$
• $\frac{\mathrm{\lambda }}{2{\mathrm{\pi \epsilon }}_0\mathrm{a}}$

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