Question 120: Electromagnetic Induction

Question

The self induced emf of a coil is 25 volts. When the current in it is changed at uniform rate from 10 A to 25 A in 1s, the change in the energy of the inductance is -

Accepted Answer

$$L{{di} \over {dt}} = 25$$
$$L 	imes {{15} \over 1} = 25$$
$$L = {5 \over 3}H$$
$$\Delta E = {1 \over 2} 	imes {5 \over 3} 	imes ({25^2} - {10^2})$$
$$ = {5 \over 6} 	imes 525 = 437.5$$ J

Answer

740 J

Answer

637.5 J

Answer

540 J

Answer

437.5 J

Electromagnetic Induction

The self induced emf of a coil is 25 volts. When the current in it is changed at uniform rate from 10 A to 25 A in 1s, the change in the energy of the inductance is -

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