A small object is connected to a lightweight cord of length L = 1.90 m  that is tied to a point P, as shown in the figure.     The object, string, and point all lie on a frictionless, orizontal table. The object has a mass m = 0.0100 kg, a charge q = +1.50 µC and is released from rest when the string makes an angle θ = 60.0° with a uniform electric field of magnitude  E = 310 V/m. Determine the speed (in m/s) of the object when the string is parallel to the electric field.  ????? m/s

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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.