A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it. The net field `vecE` at the centre O is A. `(q)/(4pi^(2)epsilon_(0)r^(2))hatj`B. `-(q)/(4pi^(2)epsilon_(0)r^(2))hatj`C. `-(q)/(2pi^(2)epsilon_(0)r^(2))hatj`D. `(q)/(2pi^(2)epsilon_(0)r^(2))hatj`

A thin semi-circular ring of radius r has a positive charge q distribu

1.	A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it. The net field `vecE` at the centre O is A. `(q)/(4pi^(2)epsilon_(0)r^(2))hatj`B. `-(q)/(4pi^(2)epsilon_(0)r^(2))hatj`C. `-(q)/(2pi^(2)epsilon_(0)r^(2))hatj`D. `(q)/(2pi^(2)epsilon_(0)r^(2))hatj`
Answer» Correct Answer - C

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A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it. The net field `vecE` at the centre O is A. `(q)/(4pi^(2)epsilon_(0)r^(2))hatj`B. `-(q)/(4pi^(2)epsilon_(0)r^(2))hatj`C. `-(q)/(2pi^(2)epsilon_(0)r^(2))hatj`D. `(q)/(2pi^(2)epsilon_(0)r^(2))hatj`

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