Part I Determining the charge on a conducting sphere
The expected relationship between the charging voltage \( V_{\mathrm{HV}} \) and the resulting charge on the sphere \( Q \) is
\[
Q=C_{\mathrm{sph}} V_{\mathrm{HV}},
\]
where \( C_{\mathrm{sph}} \) is a constant of proportionality.
Comparing Equation 2.1 to the equation of a straight line \( (y=a x+b \), where \( a \) is the gradient and \( b \) is the intercept), suggest a way to find the constant of proportionality \( C_{\mathrm{spp}} \).