JEE Main & Advanced
Physics
Electrostatics & Capacitance
Question Bank
Electric Field and Potential
question_answer
A drop of \[{{10}^{-6}}kg\] water carries \[{{10}^{-6}}C\] charge. What electric field should be applied to balance its weight (assume \[g=10m/{{s}^{2}})\] [MP PET 2002]
A) 10 V/m upward
B) 10 V/m downward
C) 0.1 V/m downward
D) 0.1 V/m upward
Correct Answer:
A
Solution :
By using Þ \[E=\frac{mg}{Q}=\frac{{{10}^{-6}}\times 10}{{{10}^{-6}}}=10\,V/m;\] upward because charge is positive.