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A charge of 2C is placed on the x -axis ...

A charge of 2C is placed on the x -axis at 1m from the origin along - ve x-axis.Infinite number of charges each of magnitude 2C are placed on x-axis at 1m,2m,4m,...from origin along + ve x -axis.The first charge is positive and alternate charges are of opposite in nature.The electric field intensity at the origin?

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