EARTH SCIENCE
MAGNETISM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Increase the current flowing to the magnet and the turbine.
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Increase the height of the dam so that water will flow faster.
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Add more electrical wires coming from the generator.
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Heat the water before it enters the generator.
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Detailed explanation-1: -Increase the number of coil turns. Increase the current flowing through the coil. Wrap the coil tightly around the iron piece. Increase the current or voltage.
Detailed explanation-2: -An electromagnet is stronger if there are more turns in the coil of wire or there is more current flowing through it. A bigger bar or one made of material that is easier to magnetize also increases an electromagnet’s strength.
Detailed explanation-3: -Which statement best compares a permanent magnet and an electromagnet? A permanent magnet has a north pole and a south pole, but an electromagnet only has a south pole.
Detailed explanation-4: -When a current is passed through the wire wrapped around the iron, its magnetic field penetrates the iron, and causes the domains to turn, aligning parallel to the magnetic field, so their tiny magnetic fields add to the wire’s field, creating a large magnetic field that extends into the space around the magnet.