Case : Read the passage and answer the question(s).

Number of magnetic field lines crossing a surface is called the magnetic flux. An electric current can be induced in a coil by flux change produced by another coil in its vicinity or flux change produced by the same coil. The former is called the mutual induction and the latter is called the self-induction. An induction furnace works on this principle. 

N Φ_B ∝ I. What is the constant of proportionality called?

Inductance

Definition.