Finding Electric Potential at a point

Find the electric potential at point P due to the grouping of charges at the other corners of the rectangle. The Coulomb constant is 8.98755 × 10⁹ N · m²/C² and the acceleration due to gravity 9.8 m/s²

Electric potential V = k * q /r Volts, where k is coulombs constant and q

is the charge.

Electric potential is a scalar quantity. So the resultant electric potential

at the point P is the sum of potentials due to individual charges.

ð V = V1 + V2 + V3

ð = k * [ (-7.12 / 0.153) + (7.54 / 0.349) + (11.4/0.381) ] * 10^-6

(Assuming that -7.12 µc is on smaller side and at a distance of

0.153m and 7.54 µc on longer side at 0.349 and

Third charge 11.4 µc at a distance of the diagonal = 0.381).

^ðV = 8.98755 * 10^9 * [(-45.752) + (21.605) + (29.921) ] * 10^-6

= 51.89 * 10^3 Volts

(If 7.12 is on the longer side and 7.54 on shorter side, the relevant

values may be plugged in and V may be recalculated as above to get

the answer).

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