The generation of a magnetic field by an electric current is

The generation of a magnetic field by an electric current is _electromagnetism_.

The correct answer is "electromagnetism".

Explanation:

Electromagnetism: it is an interaction of the electricity and the magnetism.

When the current flows in the conductor then the magnetic field lines are produces around the current carrying conductor. Here, the electric current generates magnetic field. The motion of the charges produces both electric field and the magnetic field.

This phenomenon was discovered by Oersted.

If the amount of current increases then the strength of the magnetic field will also get increase. The strength of the magnetic field depends on the amount of current flowing in the conductor.

Therefore, the generation of a magnetic field by an electric current is electromagnetism.

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freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.