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A rectangular loop of sides 8 cm and 2 c...

A rectangular loop of sides 8 cm and 2 cm with a small cut is stationary in a uniform magnetic field directed normal to the loop. The magneic field is reduced form 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 `1.6 Omega`, how much power is dissipated by the loop as heat ?

Text Solution

Verified by Experts

Induced emf =`8 xx 2 xx 10^(-4) xx 0.02 = 3.2 xx 10^(-5) V`
Induced current `= 2 xx 10^(-5) A`
Power loss = `6.4 xx 10^(-10) W`
Source of this power is the external agent responsible for changing the magnetic field with time.
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