An electric motor operating on 50 volt D.C. supply draws a current of 10 amp. If the efficiency of motor is 40%, then the resistance of the winding of the motor is

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1.5Ω

3Ω

4.5Ω

6Ω

answer is B.

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Detailed Solution

Input power P = VI = 50 × 10Power dissipated as heat = I2 R = 100 REfficiency = Output power Input power 40100=500−100R500

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