Limddong said:I think the real magenetic field is sum of the magnetic fields calculated in each cross section of solenoid with various angle and same center axis when i apply Ampere's law. (Imagine the cross section contains a part of center line of the solenoid) Please let me know why we don't do like that. :)
Thanks for answering my question! Yes, the 'real' is not appropriate word. 'Total' would be appropriate.ZapperZ said:I'm not clear what you are saying here, especially by the phrase "real magnetic field". Were you calculating an "unreal" magnetic field via other means?
There's nothing to stop you from calculating the magnetic field field at the center of a single circular loop of current, and then summing it up as you add more and more loops to form a solenoid. You'll get the same answer as applying the Ampere's Circuital method. But using the former is a lot more work!
This is no different than using Gauss's law for highly-symmetric situation to find the E-field, instead of applying Coulomb's law and doing all those nasty integrations.
Zz.
Limddong said:Ampere's law gives us just some magnetic field that is generated by current 'inside' the ampere circuital. That means the magnetic field i got from a cross section of a solenoid by Ampere's law is not total magnetic field.
A solenoid is a long, cylindrical coil of wire with multiple turns. It is often used to create a magnetic field when an electric current is passed through it.
The magnetic field inside a solenoid can be calculated using Ampere's law, which states that the magnetic field around a closed loop is proportional to the electric current passing through the loop.
Ampere's law is a fundamental law in electromagnetism that relates the magnetic field around a closed loop to the electric current passing through the loop. It is named after the French physicist André-Marie Ampère.
The magnetic field inside a solenoid is directly proportional to the number of turns in the coil. This means that increasing the number of turns will result in a stronger magnetic field, while decreasing the number of turns will result in a weaker magnetic field.
Yes, the magnetic field inside a solenoid can be controlled by adjusting the amount of current passing through the coil or by changing the number of turns in the coil. Additionally, the direction of the current can also affect the direction of the magnetic field inside the solenoid.