How does a bent wire keep spinning in a magnetic field?

In summary, the basic principle of motors and electromagnetic induction involves a wire loop with a current running through it being placed in a magnetic field. The rotation of the loop is limited to a certain point due to the reversal of current in AC motors or the use of a commutator in DC motors. This is a result of the changing magnetic field as the current moves through space.
  • #1
mpatryluk
46
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For the basic principle of motors and electromagnetic induction, when a wire loop with a current running through it is put in a magnetic field, wouldn't it only spin until it reached a certain point (i.e. flat, 180 degrees) before it stopped?

What accounts for this? Is it that the loop must use AC and that the current reverses for every half turn? Or would dc work too for induction?

Or is it a a property of the way the field of the current changes as it moves through space?
 
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  • #2
DC motor has commutator with brushes, which switches the direction of current each half turn. AC motors do not need such device, because they use rotating magnetic field.
 

FAQ: How does a bent wire keep spinning in a magnetic field?

How does a bent wire keep spinning in a magnetic field?

When a current flows through a bent wire, it creates a magnetic field around the wire. This magnetic field interacts with the magnetic field of a permanent magnet or an electromagnet, causing a force to be exerted on the wire. This force causes the wire to rotate, creating a spinning motion.

What is the relationship between the direction of the current and the direction of the spinning motion?

The direction of the spinning motion is determined by the direction of the current in the wire and the orientation of the magnetic field. In a straight wire, the direction of the current would be parallel to the direction of the magnetic field. However, in a bent wire, the direction of the current changes, causing the wire to spin in a different direction.

How does the shape of the wire affect its spinning motion?

The shape of the wire plays a crucial role in its spinning motion. A bent wire creates a larger surface area for the current to flow through, resulting in a stronger magnetic field and a more powerful spinning motion. Additionally, the angle and direction of the bend can also impact the direction and speed of the spinning motion.

Can a bent wire spin indefinitely in a magnetic field?

No, a bent wire will eventually slow down and stop spinning due to the effects of friction and resistance. The spinning motion requires energy, and over time, this energy will be lost in the form of heat and sound.

Are there any practical applications for the spinning motion of a bent wire in a magnetic field?

Yes, there are many practical applications for this phenomenon, including electric motors, generators, and speakers. These devices utilize the spinning motion of a bent wire in a magnetic field to convert electrical energy into mechanical energy or vice versa.

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