A light metal disc on the top of an electromagnet is thrown up as the current is switched on. Why? Give reason.
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due to the production of Eddy currents in the metal disc
Eddy currents are unnecessary harmful currents which are produced in an uniform metal, to reduce these simple cuts are made in the metal
Eddy currents are unnecessary harmful currents which are produced in an uniform metal, to reduce these simple cuts are made in the metal
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1.Eddy currents are induced in solid metallic sheets/cylinders, when magnetic flux linked with them changes. Direction of eddy currents can be given by Lenz’s law or by Fleming right hand rule.
2.Eddy current causes undesirable heating and wastage of power in transformer, rotating armature and dynamo.
2.Eddy current causes undesirable heating and wastage of power in transformer, rotating armature and dynamo.
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