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Question

The diagram shows a simple d.c. electric motor which is rotating. Which change makes the motor rotate more quickly?
1645239_52cb8114d5f7495d9952e02902122494.png


A
Increasing the number of turns on the coil
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B
Removing the magnets
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C
Reversing the battery
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D
Reversing the polarity of the magnets
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Solution

The correct option is A Increasing the number of turns on the coil
We can let the d.c. motor run quickly by two ways :
(a) by adding more powerful magnet so that it can add more torque .
(b) by increasing the current flowing through the coil. It can be done by increasing the number of turns of coil .

So, option (A) is correct

Physics
NCERT
Standard XII

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