Two small metal cubes with masses 2.0 g and 4.0 g are tied together by a 5.3-cm-long massless string and are at rest on a frictionless surface. Each is charged to +1.7 μC. (a).  The string is cut. What is the speed of 2-g-cube when the cubes are far apart? (b). The string is cut. What is the speed of the 4-g-cube when the cubes are far apart?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.