A tall building is protected by a lightning conductor which consists of spiked top connected by a thick strip to a plate in the ground. 1)name a suitable material which should be used to make the thick strip 2)state what happens in the lightning conductor as a negatively charged cloud passes over the building. 3) identify the type of charge left in the spikes after the cloud passes over the building 4) say how the charge on the spikes affects the nearby air molecules​