What happens when a block of metal is kept in a varying magnetic field

1.	What happens when a block of metal is kept in a varying magnetic field?
Answer» • When a block of metal is kept in a varying magnetic field then Eddy current is produced. • An eddy current is a current set up in a conductor in response to a changing magnetic field. • They flow in closed loops in a plane perpendicular to the magnetic field. • By Lenz law, the current swirls in such a way as to create a magnetic field opposing the change; for this to occur in a conductor, electrons swirl in a plane perpendicular to the magnetic field. • Because of the tendency of eddy currents to oppose, eddy currents cause a loss of energy. • Eddy currents transform more useful forms of energy, such as kinetic energy, into heat, which isn’t generally useful.

What happens when a block of metal is kept in a varying magnetic field?

Answer»

• When a block of metal is kept in a varying magnetic field then Eddy current is produced.

• An eddy current is a current set up in a conductor in response to a changing magnetic field.

• They flow in closed loops in a plane perpendicular to the magnetic field.

• By Lenz law, the current swirls in such a way as to create a magnetic field opposing the change; for this to occur in a conductor, electrons swirl in a plane perpendicular to the magnetic field.

• Because of the tendency of eddy currents to oppose, eddy currents cause a loss of energy.

• Eddy currents transform more useful forms of energy, such as kinetic energy, into heat, which isn’t generally useful.

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