two large parallel conducting plates are 12cm apart and have equal but opposite

Question

two large parallel conducting plates are 12cm apart and have equal but opposite charges on their facing surfaces. A) an elesctrostatic forces of 4.0x10^-15 N acts on a proton midway between the plates. find the electric field at the protons position. B) what is the potential difference the plates? C) A dipole consists of a +-e charges seperated by 80 pm(pico+10^-12). How much work is required to turn the dipole from being aligned with the E fiield to be perpendicular to it? answer in electron volts

Explanation / Answer

part a)

Electric field at the protons position=E=F/e

where e is chareg on proton

part b)

since E is constant in between plates

and spacing between plates=d

so potential difference V=E/d

part c)

work done=change in potential energy

U=-pEcosa

in first case

a=0

in second case a=90

dU=0-(-pE)=pE

W=pE=qsE

q=e

s=10-12

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