physics

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.
P
|
|
|
|
-Q-----+3Q------ -Q
distance between -Q and +3Q is R
distance between +3Q and P is R

What is the electric potential at the point P?



E= Voltage/(distance*dielectricconstant)

Electric potential is a scalar, so you can determine the potential at P from each of the three charges, then add them.



180

does anyone know the answer

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