1.

A series would dc motor has a total resistance of 1.5 ohm. When connected across a 115 volt and running at a certain speed it draws a current of 10 A. The back emf in the motor is

Answer»

100 V
115 V
15 V
1.5 V

Solution :If `e_(B)` is the BACK emf in the motor, then
`i=(epsilon-e_(b))/(R )`or`10=((115-e_(b))/(1.5))`
`THEREFORE e_(b)=100 V`.


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