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

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 dE_x and dE_y.

We see the electric field is directed away from the centre