You hold a ruler that has a charge on its tip 4 cm above a small piece of tissue paper to see if it can be picked up. The ruler has -12 uC of charge. The tissue has 3 g of mass. What is the minimum charge required to pick up the tissue paper ? (In uC)

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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.