Electric field due to an arc at its centre
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I know everything about this but i can't explain it here becoz it's very big and expand
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The arc is subtending angle ϕ at the center and the arc has a radius R. By symmetry we know that the electric field due to the arc will be radially outward at the center. To understand this, consider a small element of the arc of charge dQ=λRdθ on either side of horizontal to the arc.
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