Questions
Four positive point charges( +q) are kept at the four corners of a square of a side ' l '. The net electric field at the mid point of any one side of the square is,
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Correct option is B
F1=14πε0q52l2=K4q5l2 F2=14πε0q52l2=K4q5l2Horizontal components cancel each other and net force is due to vertical components=F1sinθ+F2sinθ=24q512=1521=16Kq5512
Similar Questions
Three point charges + q each are fixed at . A fourth point charge – q and mass ‘m’ is kept on z-axes at D (0,0,Z) with Z<<L and released, the minimum time taken by the fourth charge to cross the xy-plane is nearly (neglect effect of gravity)
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