Ages 13–14🔬 Science19 verified questions on this shelf
Motors & the Motor Effect
Explain the motor effect as the force on a current-carrying conductor in a magnetic field, and describe how this principle is used in electric motors and loudspeakers
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Question 1 of 3
A straight horizontal wire carries a current of 3 A to the right. It is placed in a uniform magnetic field that points directly into the page (away from you). Using the right‑hand rule, which direction does the magnetic force on the wire act? If the direction of the current is then reversed (so the current flows to the left) while the magnetic field stays the same, what direction does the force act now?
Question 2 of 3
During an investigation of the motor effect, a student places a straight, horizontal wire carrying a steady current between the north and south poles of a bar magnet. The wire moves upward. To test the role of the magnetic field, the student then reverses the direction of the current while keeping the magnet orientation the same. Which result would best support the conclusion that a magnetic field exists between the magnet poles and exerts a force on the current‑carrying wire?
Question 3 of 3
In an investigation, a straight horizontal wire carrying a current to the right is placed in a uniform magnetic field that points into the page. The wire moves upward. If the investigator reverses both the direction of the current (so it now flows to the left) and the direction of the magnetic field (so it now points out of the page), what will happen to the motion of the wire?
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