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Bertus2 Find the resistivity of n type germanium at 300K with a donor concentration,Nd= 5x10 17 atoms/m3.Given: μ n = 3900 cm2/V-s, e = 1.6 x 10 -19 C.3 A Si diode carries a current of 10 mA when a forward bias of 0.72 V is appliedat 300K (27 ° C). Findi. The reverse saturation currentii. The bias voltages required for diode currents of 1 mA and 100mA. Comment on these two voltages.iii. Reverse saturation current at 57 ° C.4 The primary is connected to the power mains: 220V, 50Hz. The turns ratio of atransformer used in a half- wave rectifier is such that the peak voltage acrossthe secondary winding of a transformer is 18V. Assuming the diode resistancein forward bias to be zero. Calculate the (i) dc voltage across the load (ii) valueof ac voltage across the load.5 a. Calculate the value of I E in a transistor for which β = 50 and I B = 15 μ A. [1]b. Why is collector current slightly less than emitter current?