Question

An electron is moving with the speed of $1$ $m/s$ at a distance of $1$ $m$, from a large sheet of charge with density $σ$ $C/m^2$. Find the maximum value of $σ$ such that electron hits the sheet after $1$ $sec$. (mass of electron = $9 × 10^{-31}$ kg, Permittivity of free space = $9\times10^{12}\;C^2/Nm^2$

• A. $4.05\times10^{-22} \;C/m^2$
• B. $8.10\times10^{-22} \;C/m^2$
• C. $4.05\times10^{-24}\; C/m^2$
• D. $2.02\times10^{-20}\; C/m^2$

Answer 1

Answer: (A)

$4.05\times10^{-22} \;C/m^2$

Answer 2

The Correct option is (A) : $4.05\times10^{-22} \;C/m^2$