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Q10. A) Define torque and explain how it is developed in a D.C. Motor. Drive from first principles an expression for the torque developed in a D.C. Motor. (6)

(b) A diode valve, having the following characteristic is connected in series with a resistor of 10,000 ohm to a 240 V d.c. supply. If a resistor of 40,000 ohms is connected between the anode and cathode, determine the current through the diode.