An electric motor operates on a $50\,\,volt$ supply and a current of $12\,A$. If the efficiency of the motor is ${\rm{30}}\,\,{\rm{\% }}$, what is the resistance of the winding of the motor

JEE PHYSICS MCQ: ELECTRO MAGNETIC INDUCTION

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An electric motor operates on a

50\,\,volt

supply and a current of

12\,A

. If the efficiency of the motor is

\mathrm{30}\,\,\mathrm{\% }

, what is the resistance of the winding of the motor

View answer and explanation

Correct option: C

2.9\,\,\mathrm{\Omega }

Option C (

2.9\,\,\mathrm{\Omega }

) is correct because it is calculated using the formula relating voltage, current, and resistance, considering the motor's efficiency.

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R

n

i=i_0 \sin \omega t

N

4 \mathrm{sec}

0.1\,\,{m^2}

\mathrm{60}

\mathrm{0}\mathrm{.4}\,\,\mathrm{T}

\mathrm{100}

\mathrm{50}\,\,\mathrm{mH}

\mathrm{2 A}