An inductor is connected to a 6.0 V direct supply which has a negligible internal resistance. The resistor (R) has a resistance of 0.8 Q. When the circuit is switched on it is observed that the current increases gradually. The rate of growth of the current is 200 As1 when the current in the circuit is 4.0 A. R (0.8 Q) 6 V L (a) Calculate the induced e.m.f. of the coil (b) Hence calculate the inductance of the coil. (c) Calculate the energy stored in the inductor when the current is 4.0 A.

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Emf and inductance

An inductor is connected to a 6.0 V direct supply which has a negligible
internal resistance. The resistor (R) has a resistance of 0.8 Q. When the circuit
is switched on it is observed that the current increases gradually. The rate of
growth of the current is 200 As-1 when the current in the circuit is 4.0 A.
R (0.8 Q)
+6
6 V
L
(a) Calculate the induced e.m.f. of the coil
(b) Hence calculate the inductance of the coil.
(c) Calculate the energy stored in the inductor when the current is 4.0 A.
(d) (i)
State the condition when the energy stored by the inductor
becomes maximum.
(ii)
Find the current at this time.
Transcribed Image Text:An inductor is connected to a 6.0 V direct supply which has a negligible internal resistance. The resistor (R) has a resistance of 0.8 Q. When the circuit is switched on it is observed that the current increases gradually. The rate of growth of the current is 200 As-1 when the current in the circuit is 4.0 A. R (0.8 Q) +6 6 V L (a) Calculate the induced e.m.f. of the coil (b) Hence calculate the inductance of the coil. (c) Calculate the energy stored in the inductor when the current is 4.0 A. (d) (i) State the condition when the energy stored by the inductor becomes maximum. (ii) Find the current at this time.
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