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NEET UG PHYSICS MCQ: CURRENT ELECTRICITY

1 Medium

1 of 1

Application +4 | -1

A motor having an armature of resistance

2\,\,\mathrm{\Omega }

is designed to operate at

220\,\,V

mains. At full speed, it develops a back e.m.f. of

210\,\,V

. When the motor is running at full speed, the current in the armature is

View answer and explanation

Correct option: A

5\,A

Option A (

5\,A

) is correct because it is the current calculated using Ohm's law with the back EMF considered.

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In the absence of applied potential, the electric current flowing through a metallic wire is zero because A metallic block has no potential difference applied across it, then the mean velocity of free electrons at absolute temperature

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\mathrm{quantity}\,\,\mathrm{/}\,\mathrm{quantities}

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\mathrm{is}\,\,\mathrm{/}\,\,\mathrm{are}