A) \[{{q}^{2}}Ey\]
B) \[qEy\]
C) \[q{{E}^{2}}y\]
D) \[qE{{y}^{2}}\]
Correct Answer: B
Solution :
Force on charged particle in a uniform electric field is \[F=ma=Eq\] or \[a=\frac{Eq}{m}\] ?(1) From the equation of motion, we have \[{{\upsilon }^{2}}={{u}^{2}}+2ay=0+2\times \frac{Eq}{m}\times y\] \[=\frac{2Eqy}{m}\] Now kinetic energy of the particle \[K=\frac{1}{2}m{{\upsilon }^{2}}=\frac{m}{2}\times \frac{2Eqy}{m}=Eq\,y\]You need to login to perform this action.
You will be redirected in
3 sec