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A thin semi-circular ring of radius r has a positive charge q distributed uniformly overit. The net electric field `vecE` at the centre O

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in 12th Physics by (6.7k points)
A thin semi-circular ring of radius r has a positive charge q distributed uniformly overit. The net electric field `vecE` at the centre O is
image
Options:
(a) `q/(4pi^2epsilon_0r^2)hatj` (b) `-q/(4pi^2epsilon_0r^2)hatj`
(c) `-q/(2pi^2epsilon_0r^2)hatj` (d) `q/(2pi^2epsilon_0r^2)hatj`

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