A small metal ball with positive charge q and mass m is attached to a very light string, as shown in (Figure 1). A larger metal ball with negative charge −Q is securely held on a plastic rod attached to the ceiling. The distance between the balls' centers is r. Write an expression for the magnitude of the force T that the string exerts on the ball. Express your answer in terms of the variables q,m,Q, r, and constants k_C and g.

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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.