Electromagnetic Induction and Temperature Effects in Electrical Circuits

QUESTION:

State
(i) two ways in which magnetic flux linkage can be changed.
(ii) Faraday`s Law of electromagnetic induction.
(b) (i) Show that the current at any time in R-L d.c circuit is given by = 1 − .
(ii) An R-L d.c circuit consists a 50mH inductor ,a 5Ω resistor and a 12 V battery. The switch is closed at = 0 seconds. Determine the current in the circuit at = 2.5 × 10 seconds.
(c) The resistance of a coil of aluminum wire at 18℃ is 200Ω. The temperature
of the wire is increased and the resistance rises to 240Ω. If the temperature coefficient of
resistance of aluminum is 0.0039/℃ at 18℃ , determine the temperature to which the coil
has risen.

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