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Figure 12 shows two identical copper coils X and Y placed close to each other. Coil X is connected to a DC power supply while coil Y is connected to a galvanometer.
(i) Explain what is observed on the galvanometer when the switch is closed.
(ii) State what is observed on the galvanometer when the switch is opened.
(iii) State what would be observed if the number of turns in coil Y is doubled.