A thin semi-circular ring of radius \( r \) has a positive P charge \( q \) distributed uniforml...
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1A thin semi-circular ring of radius \( r \) has a positive
P charge \( q \) distributed uniformly over it. The net
W field at the centre \( O \) is:
(A) \( \frac{q}{4 \pi^{2} \varepsilon_{0} r^{2}} \hat{j} \)
(B) \( -\frac{q}{4 \pi^{2} \varepsilon_{0} r^{2}} \hat{j} \)
(C) \( -\frac{q}{2 \pi^{2} \varepsilon_{0} r^{2}} \hat{j} \)
(D) \( \frac{q}{2 \pi^{2} \varepsilon_{0} r^{2}} \hat{j} \)
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