A proton starts from rest near the surface of a sheet of charge. It experiences a force of 14.0 microNewtons towards the sheet. What is the surface charge density of the sheet? (Ignore the gravitational force on the proton.)

The surface charge density of the sheet is 1547.516 C/m²

Explanation:

Given;

force experienced by the proton, F = 14.0 μN

Electric field near an infinite sheet with surface charge density (σ) is given as;

E = σ/2ε₀

The force of attraction the proton experienced towards the sheet;

F = Eq

F = q(σ/2ε₀)

where;

q is the charge of the proton

σ is the surface charge density of the sheet

ε₀ is the permittivity of free space

Therefore, the surface charge density of the sheet is 1547.516 C/m²

it is a negative acceleration