Question 51: Electrostats & Capacitance

Question

A particle of mass 3 g and charge $60 \mu \mathrm{C}$ is released from rest in a uniform electric field of intensity $10^5 N C^{-1}$. If the value of kinetic energy attained by the particle after moving through a distance of 2 cm is $m 	imes 10^{-2} J$, then the value of m is:

Accepted Answer

The kinetic energy gained is equal to the work done by the field:
$$K=qEd$$
Here
Ã¢ÂÂ¢ $q=60	imes10^{-6}$ C
Ã¢ÂÂ¢ $E=10^5$ N/C
Ã¢ÂÂ¢ $d=0.02$ m
So
$$K=(60	imes10^{-6})(10^5)(0.02)=0.12\ {m J}=12	imes10^{-2}\ {m J}$$
Hence $m=12$. (Option A)

Answer

12

Answer

6

Answer

5

Answer

4

Electrostats & Capacitance

A particle of mass 3 g and charge 60 \mu \mathrm{C} is released from rest in a uniform electric field of intensity 10^5 N C^{-1}. If the value of kinetic energy attained by the particle after moving through a distance of 2 cm is m \times 10^{-2} J, then the value of m is:

Choose the correct answer: