Four point charges of magnitude 2.7 mu or micro CC are at the corners of a square of side 5 m.

(a) Find the electrostatic potential energy if all of the charges are negative.
(b) Find the electrostatic potential energy if three of the charges are positive and one is negative.

71.06 × 10⁻³ N.m

0

Explanation:

Given that:

four point charges of magnitude = 2.7 mu

at the corners of a square of side 5m

a) Find the electrostatic potential energy if all of the charges are negative.

Electrostatic potential energy can be calculated using the formula:

P.E =  

If all the charges are negative; then, we have:

P.E  =

P.E =

P.E  =

P.E  =

P.E  = kq² (1.083)m⁻¹

P.E  = (9 × 10⁹ Nm²/C²)(2.7 × 10⁻⁶ C)²(1.083 m⁻¹)

P.E = 0.07106 N.m

P.E = 71.06 × 10⁻³ N.m

b) Find the electrostatic potential energy if three of the charges are positive and one is negative.

P.E =  

If three of the charges are positive and one is negative; we have

P.E =

P.E =

P.E =

P.E =

P.E = 0

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

b.

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