Question

Two parallel conducting plates, each of area A, are separated by a distance d. Now, the left plate is given a positive charge Q. A positive charge q of mass m is released from a point near the left plate. Find the time taken by the charge to reach the right plate.

A. `(sqrt(3dmepsilon_0A)/(qQ))`
B. `(sqrt(4dmepsilon_0A)/(qQ))`
C. `(sqrt(2dmepsilon_0A)/(qQ))`
D. none of these

Answer 1

Correct Answer - B

`E=(Q)/(2Aepsilon_(0))`
`a=(qE)/(m)=(qQ)/(2Amepsilon_(0))`
`d=(1)/(2)at^(2),t=sqrt((2d)/(a))=sqrt((2d2Amepsilon_(0))/(qQ))`