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Question 1  (a) Sketch a graph of emf induced in an inductive coil against rate of change of current. What is the significance of the gradient?
(b) Explain why it is difficult to measure the rate of change of current?
(c) How do graphs of emf against time and current against time make it possible to measure selfinductance? See Answer

Question 2
 (a) Current and voltage provided by an AC generator are sometimes negative and sometimes positive. Explain why for an AC generator connected to a resistor, power can never be negative?
(b) Explain using sketch graphs, why the frequency of variation of power in an AC generator is twice as that of the current and voltage.
See Answer 
Question 3  What determines the gradient of a graph of inductive reactance against frequency?
See Answer 
Question 4  How does doubling the frequency affect the reactance of (a) an inductor (b) a capacitor?
See Answer 
Question 5  If the peak value of a sin wave is 1000 volts, what is the effective value?
See Answer 
Question 6  Show that reactance is measured in ohms for both inductors and capacitors. See Answer

Question 7  Describe the principle of ECG.
See Answer 
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