Question
What are eddy currents? Write any two applications of eddy currents.

Answer

When a bulk piece of conductor is subjected to changing magnetic flux, the induced currents, developed in it is called Eddy current.
uses:
  • Magnetic brakes in trains.
  • Electromagnetic damping.
  • Induction furnaces.
  • Electric power meter.
  • Induction therapy.
  • To find the melting point of precious metals.
  • In speedometer of vehicles.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Write a short note : Size of the nucleus
###
How the radius of the nucleus is estimated?
Explain.
An immersion heater rated $1000W, 220V$ is used to heat $0.01m^3$ of water. Assuming that the power is supplied at $220V$ and $60\%$ of the power supplied is used to heat the water, how long will it take to increase the temperature of the water from $15^\circ C$ to $40^\circ C$?
A gas thermometer measures the temperature from the variation of pressure of a sample of gas. If the pressure measured at the melting point of lead is $2.20$ times the pressure measured at the triple point of water, find the melting point of lead.
The ground state energy of hydrogen atom is –13.6 eV. What are the kinetic and potential energies of the electron in this state?
What is Curie law in magnetism?
In half-wave rectification, what is the output frequency if the input frequency is 50 Hz. What is the output frequency of a full-wave rectifier for the same input frequency?
A spherical shell is heated. The volume change according to the equation $\text{V}_\theta=\text{V}_\theta(1+\gamma\theta)$. Does the volume refer to the volume enclosed by the shell or the volume of the material making up the shell?
Water level is maintained in a cylindrical vessel upto a fixed height H. The vessel is kept on a horizontal plane. At what height above the bottom should a hole be made in the vessel so that the water stream coming out of the hole strikes the horizontal plane at the greatest distance from the vessel.
In a Young's double slit experiment $\lambda=500\ \text{nm}, d = 1.0\ mm$ and $D = 1.0m$. Find the minimum distance from the central maximum for which the intensity is half of the maximum intensity.
Find the dimensions of:
  1. Angular speed $\omega.$
  2. Angular acceleration $\alpha.$
  3. Torque $\tau$ and
  4. Moment of interia I.
Some of the equations involving these quantities are$\omega=\frac{\theta_2-\theta_1}{\text{t}_2-\text{t}_1},\alpha=\frac{\omega_2-\omega_1}{\text{t}_2-\text{t}_1},\tau=\text{F.r}$ and $\text{I = mr}^2.$
The symbols have standard meanings.