Practically eddy currents are reduced by laminating metal plates. Armatures of electric generators and motors are wound on laminated soft iron cores. The lamination slices, which are quite thin are glued together by a non-conducting glue and this reduces eddy currents to an almost negligible value.
chrispohmomanyi answered the question on October 5, 2017 at 11:20
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state two conditions under which current flows in the circuit.
(Solved)
state two conditions under which current flows in the circuit.
Date posted:
October 5, 2017
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State the SI unit of luminous intensity.
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State the SI unit of luminous intensity.
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October 5, 2017
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What is doping of a semiconductor.
(Solved)
What is doping of a semiconductor.
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October 5, 2017
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State three similarities between the eye and the camera.
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State three similarities between the eye and the camera.
Date posted:
October 5, 2017
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What is meant by amalgamation in simple cells.
(Solved)
What is meant by amalgamation in simple cells.
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October 5, 2017
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State three reasons why it is advisable to make a periscope using prisms instead of plane mirrors.
(Solved)
State three reasons why it is advisable to make a periscope using prisms instead of plane mirrors.
Date posted:
October 5, 2017
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State what happens to the size of the the image if the pin hole camera is moved away from the Object.
(Solved)
State what happens to the size of the the image if the pin hole camera is moved away from the Object.
Date posted:
October 5, 2017
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Give a reason why the grid in a cathode ray oscilloscope is biased negatively.
(Solved)
Give a reason why the grid in a cathode ray oscilloscope is biased negatively.
Date posted:
October 5, 2017
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State two uses of radioactivity in hospitals.
(Solved)
State two uses of radioactivity in hospitals.
Date posted:
October 5, 2017
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Silicon was dipped with boron to form an extrinsic semi-conductor. What are the majority charge carriers in it.
(Solved)
Silicon was dipped with boron to form an extrinsic semi-conductor. What are the majority charge carriers in it.
Date posted:
October 5, 2017
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Answers (1)
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State two functions of a gold leaf electroscope.
(Solved)
State two functions of a gold leaf electroscope.
Date posted:
October 5, 2017
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Explain why the leaf of a positively charged electroscope falls when a candle flame is brought near its cap.
(Solved)
Explain why the leaf of a positively charged electroscope falls when a candle flame is brought near its cap.
Date posted:
October 5, 2017
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State four possible sources of background radiation.
(Solved)
State four possible sources of background radiation.
Date posted:
October 5, 2017
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Explain what is meant by background radiation.
(Solved)
Explain what is meant by background radiation.
Date posted:
October 5, 2017
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State two applications of moments.
(Solved)
State two applications of moments.
Date posted:
October 5, 2017
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Explain how wavelength varies with depth of water in a tank of variable length.
(Solved)
Explain how wavelength varies with depth of water in a tank of variable length.
Date posted:
October 5, 2017
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A tungstern filament lamp contains Argon gas at low pressure. Why is air not used?
(Solved)
A tungsten filament lamp contains Argon gas at low pressure. Why is air not used?
Date posted:
October 5, 2017
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What is the difference between P-type and N-type semiconductors.
(Solved)
What is the difference between P-type and N-type semiconductors.
Date posted:
October 5, 2017
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A scout blew a trumpet some distance from a wall, and heard its echo after 3.6 seconds later. How far is the wall from the...
(Solved)
A scout blew a trumpet some distance from a wall, and heard its echo after 3.6 seconds later. How far is the wall from the scout? (speed of sound in air is 330 m/s)
Date posted:
October 4, 2017
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Answers (1)
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Name one form of energy other than heat produced by a red-hot electric element.
(Solved)
Name one form of energy other than heat produced by a red-hot electric element.
Date posted:
October 4, 2017
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Answers (1)