An oil drop, carrying six electronic charges and having a mass of g, falls with some…
PHYSICS · Single correct · CBSE · Physics · Electric Charges and Fields · Electric Charges and Fields
Problem
An oil drop, carrying six electronic charges and having a mass of 1.6×10−12 g, 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 downward with? Ignore buoyancy.
(1) 105 NC−1
(2) 104 NC−1
(3) 3.3×104 NC−1
(4) 3.3×105 NC−1