samajh mein nahi aaya details mein bataao pls
a thin semicircular ring has a +ve charge q uniformly distributed over it. the net field at the centre is .....
i did it like this
E=o∫Π1/(4Πε0)* q/(2πr)*rdθ sinθ/r2 j
=q/(2π2ε0r2) j
but the ans is negative of that where am i wrong
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