Two point charges are on the y axis. A 3.30-µC charge is located at y = 1.25 cm, and a -2.14-µC charge is located at y = −1.80 cm. (a) Find the total electric potential at the origin.

+4 votes
asked Mar 10, 2012 in Physics by noor (51 points)

1 Answer

+2 votes

To find the electric potential at the origin you would need to add up the electric potentials of the two point charges affecting it, namely q1 and q2.

The formula for electric potential of point charge is

V = (ke*q)/r

Now you must apply this equation to q1 and q2:

V1 = (ke*q1)/r1   and  V2 = (ke*q2)/r2


plug in the values which are:


where ke = 8.988*10^9 N*m^2/C^2 

q1 = 3.3*10^-6 C

q2 = -2.14*10^-6 C

r1 = 1.25*10^-2 m

r2 = -1.8*10^-2 m

plug these values into the formula above, and add V1 and V2 to find the total electric potential

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answered Mar 11, 2012 by pokemonmaster ~Expert~ (3,854 points)