Electric field at centre O of semicircle of radius $a$ having linear charge density $\lambda $ given as

Question

${{2\lambda } \over {{\varepsilon _0}a}}$

${{\lambda \pi } \over {{\varepsilon _0}a}}$

${\lambda \over {2\pi {\varepsilon _0}a}}$

${\lambda \over {\pi {\varepsilon _0}a}}$

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