Find the potential difference across the plates given plate area, charge, and distance between plates? Why is k excluded from equation?
Area= #0.2 m^2#
Distance=#1mm#
Charge (both plates)=#4E-6C#
#ε_0=8.85E-12#
#k=9E9#
A) 0
B) #4E-2#
C) #1E2#
D)#2E2#
E)4#E8#
The answer is D). I was more confused with how to get the right answer.
I attempted to derive two equations to get V:
#C_(par.plates)=(kε_0A)/d#
and
#V=Q/C#
to
#V=(Qd)/(kε_0A)#
But when I tried to solve for V it was incorrect. An internet search told me my equation was mostly correct, except k wasn't part of the equation. Why is this?
Area=
Distance=
Charge (both plates)=
A) 0
B)
C)
D)
E)4
The answer is D). I was more confused with how to get the right answer.
I attempted to derive two equations to get V:
and
to
But when I tried to solve for V it was incorrect. An internet search told me my equation was mostly correct, except k wasn't part of the equation. Why is this?
1 Answer
May 7, 2017
You've got your constants mixed up.
Here
Think