# Electric Field value at distances from charge or plate.

1. Feb 19, 2010

### Blaze3742

1. The problem statement, all variables and given/known data
If given a single charge (q), how would one determine the Electric Field (E) value at given distances?

How about from a plate? Would the given surface area play apart here?

2. Relevant equations
F=K(q1)(q2)/r^2, K= Coulomb's Constant = 9e^9 Nm^2/C^2, F=Eq, PE=qV, V=Ed

3. The attempt at a solution

2. Feb 19, 2010

### Blaze3742

1. The problem statement, all variables and given/known data
If given a single charge (q), how would one determine the Electric Field (E) value at given distances?

How about from a plate? Would the given surface area play apart here?

2. Relevant equations
F=K(q1)(q2)/r^2, K= Coulomb's Constant = 9e^9 Nm^2/C^2, F=Eq, PE=qV, V=Ed

3. The attempt at a solution
Possibly E=Kq/r^2 for the single charge? Still working on the capacitor.

3. Feb 19, 2010

### ideasrule

Yes, E=kq/r^2 for a single charge. Where does it say that the plate is a capacitor?

4. Feb 20, 2010

### Blaze3742

Two plates are esentially a capacitor. Top plate Posotive and the Bottom plate Negative. Is there an equation to determine the Electric Field value (E,volts) at points between the plates? And what if a specific charge were placed at those points. Is there an equation to determine Electrostatic Force? Or would we just use F=k(q1)(q2)/r^2 with q1 being the plate charge and q2 being the individual charge?