100 V, 2 A, 90 rpm separately excited dc motor with armature resistance (Ra) equal to 8 ohms. Calculate back emf developed in the motor when it operates on 3^th/4 of the full load. (Assume rotational losses are neglected)

100 V, 2 A, 90 rpm separately excited dc motor with armature resistance (Ra) equal to 8 ohms. Calculate back emf developed in the motor when it operates on 3^th/4 of the full load. (Assume rotational losses are neglected)

(a) 100 V

(b) 87 V

(c) 88 V

(d) 90 V

The question was asked by my school principal while I was bunking the class.

My question comes from Methods of Starting Electric Motors topic in chapter Starting of Electric Drives

100 V, 2 A, 90 rpm separately excited dc motor with armature resistance (Ra) equal to 8 ohms. Calculate back emf developed in the motor when it operates on 3^th/4 of the full load. (Assume rotational losses are neglected)

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