1. Three charges A, B and C are placed at the locations of a circle as shown in the figure below. The circle has a diameter of 2m. (Please work out all the resultant electric fields to the horizontal i.e. parallel to the line OX)If QA = -50μC, Qв = +30 µC and Qc = +20 μC.

What is the magnitude and direction of the electric field at the centre of the circle exerted by the charges at A, B and C? \text { Take } \varepsilon_{0}=8.85 \times 10^{-12} \mathrm{C}^{2} / \mathrm{N} \mathrm{m}^{2} . \mathrm{k}=9 \times 10^{9} \mathrm{Nm}^{2} / \mathrm{C}^{2}