Multiple choice question XIII — task. Science CBSE, Class 10.

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1. What is the formula for calculating the speed of rotation of a motor?

\(N\ =\ \frac{120f}{p}\)
\(N\ =\ \frac{V}{R}\)
\(N\ =\ \frac{P}{E}\)
\(N\ =\ \frac{I}{R}\)

2. What is the principle behind the working of an electric motor?

Magnetic effect of current
Heating effect of current
Chemical effect of current
Electrostatics

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