Eddy currents are used in

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(D) Eddy currents are currents induced in a conductor when it is subjected to a changing magnetic field. These currents are utilized in various practi

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All of these

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(D) Eddy currents are currents induced in a conductor when it is subjected to a changing magnetic field. These currents are utilized in various practical applications: $1$. Induction furnaces: High-frequency eddy currents are used to produce intense heat for melting metals. $2$. Electromagnetic brakes: Used in trains to provide braking by inducing eddy currents that oppose the motion of the wheels. $3$. Speedometers: The magnetic field of a rotating magnet induces eddy currents in a metal drum,which creates a torque proportional to the speed,allowing for measurement. Since all the given options utilize eddy currents,the correct answer is $D$.

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