A liquid drop having 6 excess electrons is kept stationary under a uniform electric field of 25.5 kVm-1. The density of liquid is 1.26 × 10³ kg m3. The radius of the drop is (neglect buoyancy). (a) 4.3 x 10-7m (c) 0.078× 10-7m (b) 7.8 x 10-7m (d) 3.4 x 10-7m

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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.