Determine the electric field for up to four point charges.

• Charge Q₁ = C is at x = m, y = m.
• Charge Q₂ = C is at x = m, y = m.
• Charge Q₃ = C is at x = m, y = m.
• Charge Q₄ = C is at x = m, y = m.

The electric field at x = m, y = m is

Ex =	C/m	|E| =	C/m
Ey =	C/m	Angle =	.