An electric motor runs a D.C. source of ...

An electric motor runs a `D.C.` source of e.m.f. `200 V` and draws a current of `10A`. If the efficiency is `40%`, then resistance of the armature is:

A

`5 Omega`

B

`12 Omega`

C

`30 Omega`

D

`25 Omega`

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The correct Answer is:

B

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