Charged particles.
Attraction and repulsion

Neutral particles contain equal number of positive and negative charges. No attraction or repulsion occurs between two neutral particles.
Similar charges repel each other.
Similar charges repel each other.
Opposite charges attract
Neutral particles can be attracted by charged particles. When a negative charge is placed close to a neutral particle, the positive charges are attracted while the negative charges are repelled, as seen on the right.
What is the likely charge on rod "A" and rod "B"?
Jonathon conducted the experiment shown on the right. He concluded that rods "A" and "B" must have the same charge. Is he totally correct?
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The elastic band provides the tension to automatically close the gate. Metal contacts that complete the circuit and cause the light to glow when the gate is shut The light indicating if the gate is open or closed An electromagnet that activates the lock The bolt that is lifted through a screw eye by the electromagnet The gate
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Generator The nucleus of an atom containing protons and neutron.