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Three positive point charges of 3.0 nC, 6.0 nC, and 2.0 nC,respectively, are arranged in a triangular pattern, as shown. Findthe magnitude and direction of theelectrical force acting on the6.0 nC charge.
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A 220 V shunt motor takes 105 A. The armature resistance 0.08 Ω and shunt filed resistance is 44 Ω. The motor runs at 950 r.p.m. If iron and friction losses are equal to 2 kW, find (i) brake horse power (b.h.p.), (ii) total torque and (iii) shaft torque.

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2) (a) Describe the principle of operation of 3-phase induction motor. [8 Marks](b) Explain slip as applied to three phase induction motor. [2 Marks]3) Derive an expression for the total armature torque of DC motor. [10 Marks]5) List the starting methods used in starting 3-phase induction motors and explain any two of these methods. [10 Marks]6) (a) A 60 kW, 400 V d.c. shunt motor has 4 poles a 2-circuit wave-connected armature winding with 450 conductors. The flux per pole...
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Question (1)Explain with relevant diagrams, resistance commutation and how it helps in improving commutation. Question (4)A 240 V, 4 – pole shunt motor running at 1000 r.p.m. gives 15 h.p. with an armature current of 50 A and fieldcurrent of 1 A. The armature winding is wave connected and has 540 conductors. The armature resistance is 0.1Ω and the drop at each brush is 1 V. Calculate (i) the useful torque (ii) the total torque (iii) useful flux per poleand (iv)...