Charge q is uniformly distributed over a thin half ring of radius R .The electric field at the centre of the ring is?

Description: /img/shared/discuss_editlive/2191102/2012_05_10_10_39_18/image6329271663632253330.jpg

Let us consider a semi-circular ring with uniform charge q with radius r.

Let λ be the charge density of the ring.

Now the electric field dE due to a small length dl at centre O is resolved into two components dEx and dEy.

We see the electric field is directed away from the centre

Description: /img/shared/discuss_editlive/2191102/2012_05_10_10_39_18/image3555144543320323792.jpg

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