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Suppose the loop in Exercies.4 is statio...

Suppose the loop in Exercies.4 is stationary but the current feeding the electromagnetic net that produces the magnetic field is gradually reduced so that the field decreases from its initial value of 0.3 T at the rate of 0.02 T `s^(-1)`. If the cut is joined and the loop has a resistance of `1.6Omega`, how much power is dissipated by the loop as heat? What is the source of this power?

Text Solution

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`varepsilon=(dphi_(B))/(dt)=A.(dB)/(dt)=8xx2xx10^(-4)xx0.02=3.2xx10^(-5)V`
Induced current, `I=(varepsilon)/(R)=(3.2xx10^(-5))/(1.6)=2xx10^(-5)A`
Power loss = `P=varepsilonI=3.2xx10^(-5)xx2xx10^(-5)=6.4xx10^(-10)W`
Source of this power is the external agency which brings the change in the magnetic field.
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