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Magnetism. Magnetism is an invisible force between two magnetic objects or

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between a magnetic object and an object made of magnetic materials such as iron.

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Bar magnets are permanent magnets. They have two poles, north and south. The north

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is positively charged and the south is negatively charged. Different poles

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attract each other. Same poles repel each other. The magnetic field describes

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the area of influence of the magnets. We represent it with lines to show the

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direction of the forces. Now check your learning. Electricity is the movement of

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electrons from one atom to another. All matter is made up of atoms. An atom has a

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nucleus made up of protons, positive charges, and neutrons, no charge. Electrons

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that are negative charges are particles that orbit around the nucleus. An

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electric circuit is a path where the electric current can flow. We can usually

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find the following components in an electric circuit. First, electricity is

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stored in a battery. Second, wires are made of metal. Third, the switch turns the

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electricity on and off. When the circuit is closed, the electricity flows. When the

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circuit is open, the electric current can't flow. Now check your learning.