4. By electromagnetic separation, where are magnetic particles collected in concentration? a) Away from the magnetic roller b) On the conveyor belt c) Below the magnetic roller d) Above the magnetic roller
Answer: c Explanation: The powdered ore is dropped over a conveyor belt that moves around two rollers, one of which is equipped with an electromagnet. The magnetic roller attracts the magnetic particles when the ore particles move across the belt. As a result, two heaps form independently. Magnetic particles are gathered below the magnetic roller, whereas non-magnetic particles are collected away from the roller.
