1.

Explain any two applications of eddy current.

Answer» (i) Electric breaks in train

(ii) Electric furnace
  1. Dead beat galvanometer: when a galvanometer is used for measuring current the coil is wound on a light aluminium frame to bring coil quickly to rest .This is because the motion of metal frame in magnetic field give rise  eddy current  in frame.
  2.  Electric break : when current is to stop  the power supplies to rotates the axis is switched of .At same time a stationary magnetic field is applied to rotating durm give rise to strong eddy current in drum . This eddy current produce torque which oppose rotation and stop a train smoothly and quickly


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