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A half ring of radius R has a charge of ...

A half ring of radius R has a charge of `lambda` per unit length. The potential at the centre of the half ring is :

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Refer to the precious question `vec(dE)=dE_(x) hat(i)+dE_(y) hat(j)" ":.` on solving `E_("net")=(K lambda)/R (hat(i)+hat(j))`
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