ai. Define the electric potential at a point in an electric field.

ii.  An uncharged body, A, was charged electrostatically by a test charge, B, using the method of induction and the method of contact. State two differences between the two methods.

b. An important precaution during an electricity experiment is to open the circuit when no readings are being taken. Give two reasons for the stated precaution.

ci. Fig. 11.0 is a circuit diagram in which a coil of inductance, L, and a resistor of resistance, R, are connected to a variable alternating source of frequency, f.

     

The table shows the square of the impedance, \(Z^2\); corresponding to each value of \(ƒ^2\).

    

\(ƒ^2\)/ \(Hz^2\)	198.80	400.00	600.30	800.90	900.00
\(Z^2\)/ \(Ω^2\)	249.60	400.00	550.30	702.30	800.90

Write down the equation for Z in terms of \(f^2\), \(R^2\), and \(L^2\).

ii. Plot a graph \(Z^2 against \(f^2\) of and use it to determine the values of:
i. L
ii. R
[\(π^2\) = 10]