In the figure,the switch S is closed so that | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) When the switch $S$ is closed,current flows through the circuit,and energy is stored in the inductor in the form of a magnetic field. The magnetic

Vedclass · Accepted Answer

a rapid flux change in $L$

Vedclass · Answer

(C) When the switch $S$ is closed,current flows through the circuit,and energy is stored in the inductor in the form of a magnetic field. The magnetic flux linked with the inductor is given by $\phi = LI$.When the switch $S$ is opened,the current in the circuit drops to zero almost instantaneously. Since the inductor opposes any change in the current flowing through it,it induces a large back emf given by $\varepsilon = -L(dI/dt)$.Because the time interval $dt$ for the current to drop to zero is extremely small,the rate of change of current $(dI/dt)$ is very large,leading to a very high induced emf.This high induced emf causes a rapid change in the magnetic flux linked with the inductor,which ionizes the air between the switch contacts,resulting in a spark.

In the figure,the switch $S$ is closed so that a current flows in the iron-core inductor which has inductance $L$ and the resistance $R$. When the switch is opened,a spark is obtained at the contacts. The spark is due to

Similar Questions

Radio frequency choke uses a core of

Two circular coils $P$ and $Q$ are fixed coaxially and carry currents $I_1$ and $I_2$ respectively.

Two similar circular loops carry equal currents in the same direction. On moving the coils further apart,the electric current will

Which of the following is constructed on the principle of electromagnetic induction?

The diagram below shows two coils $A$ and $B$ placed parallel to each other at a very small distance. Coil $A$ is connected to an ac supply. $G$ is a very sensitive galvanometer. When the key $K$ is closed:

Vedclass Test Series

Exam Paper Generator

Online Exam Module