Magnet moving in a long long solenoid

In summary, there is a debate about whether a moving magnet inside a solenoid will result in an induced emf. Some argue that there will be no induced emf, while others believe that there will be an induced emf due to the changing magnetic flux. The direction of the induced current will depend on the location of the magnet within the solenoid and the number of turns in the coil. Ultimately, Faraday's law of electromagnetic induction states that a conductor will experience an induced emf whenever there is a changing magnetic flux. It is important to focus on induced emf rather than induced current in this area of physics.
  • #1
Deathnote777
29
0
I have heard that when a magnet is moving completely inside a solenoid, there will be no induced emf. Is that true ? Personally, I think even the magnet is moving inside a solenoid with speed v, there will still be induced emf.

Assume a magnet is moving inside a solenoid from left to right. Right side is north pole and left is south. When it's moving in the solenoid, there will be current induced in the right side to oppose the north pole of the magnet. As for the left side, an opposite-direction current will be induced to attract the south pole. In this case, since the no. of turns of coil is different between the right side and left side from the magnet (assume the magnet is not in the middle), the will be net emf induced. Am I right ? Thx~
 
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  • #2
Faradays law of electromagnetic induction states that WHENEVER a conductor experiences a changing magnetic flux linkage an emf will be induced...so yes...you are on the right track.
It is always wise in this area of physics to start, and concentrate on induced EMF...you may not get an induced current !
 

What is a solenoid?

A solenoid is a coil of wire that creates a magnetic field when an electric current is passed through it. It is often used in electromagnets and inductors.

What is a long long solenoid?

A long long solenoid is a solenoid that is very long in comparison to its diameter. It is often used in scientific experiments and in industrial applications.

How does a magnet move in a long long solenoid?

A magnet moves in a long long solenoid by aligning its poles with the magnetic field lines created by the solenoid. This causes the magnet to move through the solenoid in a straight line.

What factors affect the movement of a magnet in a long long solenoid?

The movement of a magnet in a long long solenoid can be affected by the strength of the magnet, the strength and direction of the magnetic field created by the solenoid, and any external forces acting on the magnet.

What are some practical applications of a magnet moving in a long long solenoid?

A magnet moving in a long long solenoid can be used in devices such as electric motors, generators, and speakers. It is also commonly used in scientific experiments to study the properties of magnets and magnetic fields.

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