The spark plug in an automobile engine is an `R-L` circuit as shown in figure. The circuit that provides the spark uses an inductor as the energy source. Initially switch is closed and allows current to build through the inductor. When the switch is open the current decreases rapidly through inductor and a large emf is induced by inductor Given `verepsilon = 12V, L=10mH,Rc=10Omega,R_(p)=7kOmega`

The spark occurs in the spark plug because

Options

A. Spark plug short circuits the inductor.
B. Spark plug short circuits the battery.
C. Due to large induced emf generated by inductor air in the gap in spark plug gets onized.
D. Spark produced is due to conversion of magnetic field energy of inductor to visible electromagnetic radiations.

Answer

C

Explanation

When switch is opened, the inductor opposes change in flux by inducing a current in it. A large potential difference develops across the inductor for change to jump the spark plug gap.