Asked by k.
5. What is the effect of a magnetic field on a stationary electric charge? On a moving electric charge?
6. Why is it a good idea to have the coil of a solenoid wound closely with many turns of wire?
7. What is the purpose of the commutator in an electric motor?
8. What causes the membrane in a loudspeaker to vibrate?
in short sentences, 8th grader terms
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5. A stationary electric charge feels no force from a magnetic field. A moving electric charge feels a force sideways, which makes it curve; the faster it moves and the stronger the field, the bigger the force.
6. Many close turns make the solenoid’s magnetic field much stronger and more uniform. This gives a stronger magnet for the same electric current.
7. The commutator flips the current in the motor coil every half turn. This keeps the coil pushed in the same rotational direction so the motor keeps spinning.
8. The audio electric signal makes a coil move in a magnet. The moving coil pulls and pushes the speaker membrane (cone). The membrane pushes air and creates the sound we hear.
6. Many close turns make the solenoid’s magnetic field much stronger and more uniform. This gives a stronger magnet for the same electric current.
7. The commutator flips the current in the motor coil every half turn. This keeps the coil pushed in the same rotational direction so the motor keeps spinning.
8. The audio electric signal makes a coil move in a magnet. The moving coil pulls and pushes the speaker membrane (cone). The membrane pushes air and creates the sound we hear.
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