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# Statement of a problem № 3902

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For the circuits shown in Fig. 14.4a, b consisting of resistors, capacitors and inductors (i) Derive the expression to represent the complex impedances for each of the networks. (ii) Work out the magnitude of the impedance for each of the networks given that the frequency of the supply voltage is 150 Hz. (a) Define what is meant by electric current and current density. (b) When we refer to a quantity of charge we say that the value is quantized. Explain what is meant by quantized. (c) A thin copper bar of rectangular cross-section of width 5.6 mm and height 50 nm has an electron density of n = 8.5x10^28 /m3 . If a uniform current of i = 2.4x10^(-4) A flows through the strip (i) Find the magnitude of the current density in the strip. (ii) Find the magnitude of the drift speed of the charge carriers. (iii) Briefly explain why the current is relatively high for such a small drift sp

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