You have a vertical polyethylene rod. It is 30 cm. It Carries a negative charge Q=-3μC which is distributed uniformly allong it's length. A 51 gram marble of glass Carriies a positive q= +0.44 μC charge  . The marble hangs from the rod from a plastic string, 10 cm below the rod. What is the tension in the string?.  a. 0.8N b. 0.5N c.0.3N d. 0.2N e. 0N

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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.