posted by kevin .
1) A parallel plate capacitor has a potential difference between its plates of 1.2 V and a plate separation distance of 2.0 mm. What is the magnitude of the electric field if a material that has a dielectric constant of 3.3 is inserted between the plates?
2) Three point charges –Q, –Q, and +3Q are arranged along a line as shown in the sketch.
distance between -Q and +3Q is R
distance between +3Q and P is R
What is the electric potential at the point P?
Electric potential is a scalar, so you can determine the potential at P from each of the three charges, then add them.
does anyone know the answer