An oil drop

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An oil drop, carrying six electronic charges and having a mass of 1.6×10^−12g, falls with some terminal velocity in a medium. What magnitude of vertical electric field is required to make the drop move upward with the same speed as it was formerly moving down ward with ? Ignore buoyancy.
06
Dec
An oil drop, carrying six electronic charges and having a mass of 1.6×10^−12g, falls with some terminal velocity in a medium. What magnitude of vertical electric field is required to make the drop move upward with the same speed as it was formerly moving down ward with ? Ignore buoyancy. An isolated charge q1 of [...]
Posted in: Cengage JEE Mains Physics by B.M Sharma , Chapter 17 - Electric Charge and Field ,
Tags: An isolated charge q1 of mass m is suspended freely by a thread of length l. Another charge q2 is brought near it (r>>l). When q1 is in equilibrium tension in thread will be , An oil drop , carrying six electronic charges and having a mass of 1.6×10^−12g ,