(a)(i) The coulomb is defined as the quantity of electric charge passing through a point in a conductor when a steady current of one ampere passes for one second.
(ii) Resistance is the opposition offered to the flow or passage of an electric current in a conductor.

(b) The effects of electric current are:
(i) Magnetic (ii) Chemical
(iii) Heating or thermal.

(c) The standard international colour for insulating cover for a three in plug are:
(i) Live is brown or red colour.
(ii) Neutral is blue or black colour.
(iii) Earth is green/yellow/green and yellow colour.

(d) Clock wise moment = 4gl\(_2\) + \(\frac{kq^2l_3}{12}\)
\(\frac{4 \times 10 \times 1 + 8.99 \times 10^9 \times q^2 \times 3}{(2.5)^2}\) = 40 + 4.315 x 10\(^{9}\) x \(q^{2}\)
Anti-clockwise moment = 5gl\(_1\) = 5 x 10 x 1 = 50 Nm
But sum of clockwise moment = Anti-clockwise moment 40 + 4.315 x 10\(^9\) q\(^2\) = 50
q = \(\sqrt{\frac{10}{4.315 \times 10^9}}\)
= 4.814 x 10\(^{-5}\)C