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Assertion :Eddy currents generate resistive losses that transform some forms of energy, such as kinetic energy, into heat.As shown in figure disc is stopped after some time. Reason: Energy lost by eddy current = change in kinetic energy of disk
Assertion :Eddy currents generate resistive losses that transform some forms of energy, such as kinetic energy, into heat.As shown in figure disc is stopped after some time. Reason: Energy lost by eddy current = change in kinetic energy of disk
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
An eddy current is a swirling current set up in a conductor in response to a changing magnetic field. By Lenz's law, the current swirls in such a way as to create a magnetic field opposing the change; to do this 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 energy to be lost. More accurately, eddy currents transform more useful forms of energy, such as kinetic energy, into heat, which is generally much less useful. In many applications the loss of useful energy is not particularly desirable, but there are some practical applications. One is in the brakes of some trains. During braking, the metal wheels are exposed to a magnetic field from an electromagnet, generating eddy currents in the wheels. The magnetic interaction between the applied field and the eddy currents acts to slow the wheels down. The faster the wheels are spinning, the stronger the effect, meaning that as the train slows the braking force is reduced, producing a smooth stopping motion.Energy lost by eddy current = change in kinetic energy of disk.
Assertion and Reason are correct and Reason is the correct explanation for Assertion
An eddy current is a swirling current set up in a conductor in response to a changing magnetic field. By Lenz's law, the current swirls in such a way as to create a magnetic field opposing the change; to do this 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 energy to be lost. More accurately, eddy currents transform more useful forms of energy, such as kinetic energy, into heat, which is generally much less useful. In many applications the loss of useful energy is not particularly desirable, but there are some practical applications. One is in the brakes of some trains. During braking, the metal wheels are exposed to a magnetic field from an electromagnet, generating eddy currents in the wheels. The magnetic interaction between the applied field and the eddy currents acts to slow the wheels down. The faster the wheels are spinning, the stronger the effect, meaning that as the train slows the braking force is reduced, producing a smooth stopping motion.Energy lost by eddy current = change in kinetic energy of disk.
Assertion and Reason are correct and Reason is the correct explanation for Assertion
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