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An electric motor operating on a 60 V d...

An electric motor operating on a `60 V` dc supply draws a currrent of `10A`. If the effeciency of the motor is `50%`, the resistance of its winding is

A

`6Omega`

B

`4Omega`

C

`2.9Omega`

D

`3.1Omega`

Text Solution

Verified by Experts

The correct Answer is:
C
`eta=(e)/(E)xx100impliese=0.3E`
Now, `i=(E-e)/(R )=(220-210)/(2)=(10)/(2)=5A`
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