Electrolytic reduction cell used for conversion of calcined Al2O₃ to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to

Achieve very high purity of aluminium (99.9%)

Keep the electrolyte in liquid condition by the generation of heat

Electrolytically dissociate alumina

If a coil is wound around a steel core and electric current is passed through the coil the steel core acts as a?

Neither electromagnet nor permanent magnet

Either electromagnet or permanent magnet

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