An automated recycling facility uses a rotating non-magnetic drum separator and an internal electromagnet to separate magnetic steel cans from non-magnetic aluminium cans, as shown in the diagram.
a.[2]
Explain how the electromagnet and rotating drum are used to separate the steel cans from the aluminium cans.
b.[2]
Describe two ways to increase the strength of the magnetic field produced by the electromagnet.
c.[1]
Write down the equation that links distance travelled (sss), speed (vvv), and time (ttt).
d.[2]
The outer surface of the drum moves at a constant speed of 0.75 m/s0.75 \text{ m/s}0.75 m/s. Calculate the time taken for a steel can to travel a distance of 1.8 m1.8 \text{ m}1.8 m along the drum surface. Give your answer to 2 significant figures.