SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Electricity is related to magnetism
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Magnets use chemical reactions to create electricity
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Electricity can produce a magnetic field and cause iron and steel objects to act like magnets.
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Magnetic fields can produce electrical current in conductors.
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Electromagnets are temporary magnets that lose their magnetism when the electric current is removed.
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Detailed explanation-1: -The correct option is D Magnetic poles exert maximum attraction.
Detailed explanation-2: -Electromagnets behave as a magnet only when electric current flows through them. So, they are temporary magnets.
Detailed explanation-3: -Electromagnets are a special class of magnets with properties such as: The polarity of the magnets can be reversed by reversing the current flow. As long as electric current flows through them, they behave as magnets, i.e. they are temporary magnets and hence can be switched on and off.
Detailed explanation-4: -A magnet has two poles known as North-Pole and South-Pole. A magnet, when suspended freely, always rests in a north-south direction. A magnet has attractive properties. Like poles of magnets repel each other whereas unlike poles attract each other.