Physics
The speed of rotation of coil can be increased by :
- decreasing the strength of the magnetic field
- decreasing the area of the coil
- increasing the area of the coil
- decreasing the number of turns in the coil
Electro-Magnetism
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Answer
increasing the area of the coil
Reason — One way to increase the speed of rotation of coil, is by increasing the area of the coil. When the area of the coil is increased, more magnetic field lines are intersected as the coil rotates, leading to a greater change in magnetic flux and hence a higher induced EMF and higher speed of rotation.
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