The schematic diagram below shows an induction cooktop being used to heat water in a steel pan.

Which of the following best explains how the water is heated?

A
The ceramic top plate heats up as the magnetic field transfers heat energy directly to the top plate. The pan and water are then heated by conduction.

B
The current from the coil is transferred by means of the magnetic field to the pan. The pan then induces a current in the water, which heats due to resistance.

C
The copper coil heats up as it resists the electric current. This heat is then transferred by convection through the ceramic cooktop and pan to the water.

D
The steel pan heats up as it resists the induced movement of electrons caused by the changing magnetic field. The water is heated by conduction.

The water is heated as the current from the coil is transferred by means of the magnetic field to the pan. The pan then induces a current in the water, which heats due to resistance. That is option B.

What is cooking by induction?

Induction cooking is referred to the transfer of heat energy from one source to another through a magnetic field that helps in the movement of electrons.

Heat cannot be transferred to the water without changes of the magnetic field.

Other examples of how heat is being transferred to other body surfaces include the following:

Convention,

Conduction,

Evaporation and

Radiation.

Therefore, the diagram above displays the heat transfer from the copper coil carrying current to the water in the steel pan is by induction.

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