Magnetic Field due to Current in a Solenoid
- A coil with many circular close turns of insulated copper wire (like a cylinder as shown above) is a solenoid.
- One end of such a solenoid behaves like the north pole and the other as a south pole.
- Therefore magnetic field due to current in the solenoid is similar to a bar magnet. The fields always emerge out of the North pole and always merge into the South pole
- The field inside the solenoid is uniform.
- The strong magnetic field inside the solenoid is so strong that it can be used to magnetize a piece of soft iron when it is placed inside the coil. The magnet formed like this is called a Electromagnet