(a)[2]
State the sign of the charge at the top of the metal pole. Explain, in terms of the particles involved, how it becomes charged.
(b(i))[2]
Calculate the average current in the lightning conductor during this time.
(b(ii))[1]
It is suggested that the current in the lightning conductor could be measured by connecting a laboratory ammeter between the pole and the copper strip. State one reason why this cannot be successful.
(c)[1]
The copper strip has a large cross-sectional area. State how increasing the cross-sectional area of the copper strip affects its resistance.