Advertisements
Advertisements
प्रश्न
What are eddy currents?
Advertisements
उत्तर
Whenever a conductor or a part of it is moved in a magnetic field, “cutting” magnetic field lines, or placed in a changing magnetic field, the free electrons in the bulk of the metal start circulating in closed paths equivalent to current-carrying loops. These loop currents resemble eddies in a fluid stream and are hence called eddy or Foucault currents.
APPEARS IN
संबंधित प्रश्न
State any two causes of energy loss in actual transformers.
Describe briefly three main useful application of eddy currents ?
If the magnetic field outside a copper box is suddenly changed, what happens to the magnetic field inside the box? Such low-resistivity metals are used to form enclosures which shield objects inside them against varying magnetic fields.
Metallic (nonferromagnetic) and nonmetallic particles in a solid waste may be separated as follows. The waste is allowed to slide down an incline over permanent magnets. The metallic particles slow down as compared to the nonmetallic ones and hence are separated. Discuss the role of eddy currents in the process.
How are eddy currents generated in a conductor which is subjected to a magnetic field?
Write two examples of their useful applications .
State applications of eddy currents.
In which of the following devices, the eddy current is not used ______
Why and where are eddy currents are undesirable? How are they minimized?
How is Eddy current produced? How do they flow in a conductor?
Give the uses of Foucault current.
The plane in which eddy currents are produced in a conductor is inclined to the plane of the magnetic field at an angle equal to ______.
A constant retarding force of50 N is applied to a body of mass 20 kg moving initially with a speed of 15 ms-1. How long does the body take to stop?
Two simple pendula of length L and 4L are pulled aside to the right and are at rest so that they make an angle 30° with the vertical. They are then released simultaneously at time t = 0. The time after which they will be in phase is ______.
If the length of a simple pendulum increases by 5%, then its period shall increase by ______.
For high frequency, capacity offers
Which one is not an application of eddy current?
Eddy currents are also known as ______
