1. Two very large parallel plates are oppositely and uniformely charged. The ele

Question

1. Two very large parallel plates are oppositely and uniformely charged. The electric field between the plates has a magnitude of 1.7X10^6 N/C,

A) How dense is the charge on each plate?

B) How much charge is on each plate if they are 15 cm on a side?

2. A positive charge q+ is located at the origin. A second charge of -2q is located on the x-axis at x=1 cm. A third charge of +3q is located on the x axis at x=2 cm. Sketch the electric field lines for this system of charges. What will the field lines look like far away from these charges.

Include drawing

Explanation / Answer

1)the field between 2 parallel plates is given by E=sigma/eo

or s/(8.85*10^-12)=1.7*10^6

or s=1.5*10^-5 C/m^2

b)let the charge on each plate be q.so,

q/(0.15^2)=1.5*10^-5

or q=0.3375 uC

b)electric field lines will point towrds the negative charge originating from the positive charges

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