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How is Eddy current produced? How do they flow in a conductor? - Physics

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प्रश्न

How is Eddy current produced? How do they flow in a conductor?

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उत्तर

Even for a conductor in the form of a sheet or plate, an emf is induced when magnetic flux linked with it changes. But the difference is that there is no definite loop or path for induced current to flow away. As a result, the induced currents flow in concentric circular paths. As these electric currents resemble eddies of water, these are known as Eddy currents. They are also called Foucault currents.

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अध्याय 4: Electromagnetic Induction And Alternating Current - Evaluation [पृष्ठ २६०]

APPEARS IN

सामाचीर कलवी Physics - Volume 1 and 2 [English] Class 12 TN Board
अध्याय 4 Electromagnetic Induction And Alternating Current
Evaluation | Q II. 5 | पृष्ठ २६०

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State any two causes of energy loss in actual transformers.


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Describe briefly three main useful application of eddy currents ?


A metal sheet is placed in front of a strong magnetic pole. A force is needed to ______________ .
(a) hold the sheet there if the metal is magnetic
(b) hold the sheet there if the metal is nonmagnetic
(c) move the sheet away from the pole with uniform velocity if the metal is magnetic
(d) move the sheet away from the pole with uniform velocity if the metal is nonmagnetic.
Neglect any effect of paramagnetism, diamagnetism and gravity.


If in a galvanometer the coil is wound on a bad conductor, the eddy current will be ______.

Which of the following does not use the application of eddy current?

Induction furnace make use of ______.

When strength of eddy currents is reduced, as dissipation of electrical energy into heat depends on the ...A... of the strength of electrical energy into heat depends on the ...A... of the strength of electric current heat loss is substantially ...B.... Here, A and B refer to ______.

Identify the wrong statement.


A metal plate is getting heated. It can be because ______.

  1. a direct current is passing through the plate.
  2. it is placed in a time varying magnetic field.
  3. it is placed in a space varying magnetic field, but does not vary with time.
  4. a current (either direct or alternating) is passing through the plate.

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