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JEE Mains Model Paper 9

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Question : 13

Total: 90

A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it. The net field

at the centre O is

q
4π2ε0r2

^
j
−
q
4π2ε0r2

^
j
−
q
2π2ε0r2

^
j
q
2π2ε0r2

^
j

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