Two small metallic spheres each of mass ‘m’ are suspended together with strings of length ‘l’ and placed together. When a quantum of charge ‘q’ is transferred to each the strings make an angle of 90° with each other. The value of ‘q’ is

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Two small metallic spheres each of mass ‘m’ are suspended together with strings of length ‘l’ and placed together. When a quantum of charge ‘q’ is transferred to each the strings make an angle of 90° with each other. The value of ‘q’ is