Question

Induction furnace makes use of:
A. Self-induction
B. Mutual induction
C. Eddy current
D. None of these

Answer 1

An induction furnace is indeed an electric furnace where the heat is applied via metal induction heating. The power of the induction furnace ranges from less than one kilogramme to only one hundred tonnes that is used for the melting of steel and iron, copper, aluminium and precious metals.

Stepwise solution:

The induction furnace surrounds the jar with an alternating electrical current-carrying coil. Eddy currents are driven into the coil so that by creating high temperatures that are required for melting and producing the alloys, these currents are distributed.

Therefore, induction furnaces make use of eddy current.
Hence, the correction option is C

Additional information:

Self-induction is a mechanism by which an induced emf is produced in the coil itself by such a changing electric current. The ratio of induced electromotive force (EMF) through a coil to the amount of current shift across the coil is self-inductance. We signify self-inductance with English letter L or coefficient of. Henry is the unit.

Mutual Inductance is indeed the magnetic field contact with one coil on another coil when it produces a voltage in the opposite coil. Due to the shifting magnetic field surrounding its own turns, an inductor produces an induced emf within itself.

According to Faraday's induction law, Eddy currents are loops of electric current caused between conductors by a shifting magnetic field throughout the conductor.

Note:

For the heat treatment of metal products, induction heating is also used. Induction hardening in steel parts, induction welding / brazing as a way of connecting metal components or induction annealing can selectively soften a region of a steel portion are the most common uses.