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A semi-cricular arc of radius a is charg...

A semi-cricular arc of radius a is charged unformly and the charge per unit length is `lambda`. The electric field at the centre is

A

`lambda/(4pi^2epsilon_0a)`

B

`lambda/(2piepsilon_0a^2)`

C

`lambda/(2piepsilon_a)`

D

`lambda^2/(2piepsilon_0a)`

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