Energy Stored In An Inductor MCQ - Practice Questions with Answers

Rate of increment of energy in an inductor with time in series LR circuit getting charged with a battery of e.m.f. E is best represented by: [ inductor has initially zero current ]

What is the time at which the rate of dissipation of energy (Joule's heat) across the resistance is equal to the rate at which magnetic energy is stored in the inductor?

An inductor coil of inductance L is divided into two equal parts and both parts are connected in parallel. The net inductance is :

The equivalent inductance between points P and Q in the figure is:

The dimension of $\sqrt{\frac{L}{\mathrm{C}}}$ is same as that of:

Shown in the figure is an R-L-C circuit. In a steady state, the ratio of energy stored in the inductor & capacitor is equal to

An inductor coil stores 32 J of magnetic energy and dissipates energy as heat at the rate of 320 W when a current of 4A is passed through it. What is the time constant of the circuit when this coil is joined across an ideal battery?

A solenoid of inductance 100 mH and resistance 20 is connected to a cell of emf 10 V. What is the energy stored in the inductor when the time t = 5 ln 2 milli sec?

A constant current flows in an R-L circuit. Then

A source emitting sound at a frequency of $f_0$ moves toward a stationary observer with a speed of $v_s=50\mathrm{m}/\mathrm{s}$. The speed of sound in air is $v=350\mathrm{m}/\mathrm{s}$. What is the apparent frequency heard by the observer if the actual frequency of the source is $f_0=500\mathrm{Hz}$?