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1. Positive and negative charges are distributed evenly in two parallel plates with width "w". The density of the positive and negative charge is +[tex]\rho[/tex] and -[tex]\rho[/tex]. Assume that the length of the plates at y direction is [tex]\infty[/tex]

(a) Find the electric field in the plates

(b) Let the electric potential at x=-w equal to 0, find the electric potential in the plates.

2. Relevant equations

[tex]\Delta[/tex]E=k*Delta-Q*r/r^{2}whereris the unit vector -- (1)

3. My approach

I sliced an infinitesimal portion of the plate horizontally denoted as Delta-y and represent the charge Delta-Q = rho *Delta-y*2*w. Is my expression for Delta-Q correct?

ris the observation point which is at opposite to the portion Delta-y on the negative plate of which magnitude is "w".

Substitute my expression for Delta-Q into (1), I obtain Delta-E= k*rho/w.

Do I have to integrate Delta-Efrom -infinity to +infinity to obtain the electric field in the plates? If so, I will getE=0. Does this make sense?

Thank you.

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# Homework Help: Electric field between two plates

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