Magnetic Field
Electric field exists near a charged object. Similarly, magnetic field exists around a magnet. If an isolated magnetic pole is brought near a magnet, it experiences force and the region near the magnet, where forces act on a magnet pole, is called magnetic field. The space in which magnetic poles experience force is called magnetic field. The magnetic lines of force emerge from N pole and enters in south pole, thus forming close loop for magnetic circuit.
megnatic feald
Electromagnetism
It is the production of magnetic field from electricity. When an electric current flows through a conductor, magnetic field is set up all along the length of the conductor.
Electromagnetism
Magnetic Effect of Electric Current:
1. Greater the current through the conductor, stronger the magnetic field and vice versa.
2. Magnetic field near the conductor is stronger and becomes weak as we go away from the conductor.
3. Magnetic lines of force around the conductor will either be clockwise or anti-clockwise. It depends on the direction of current.
4. The shape of the magnetic field depends on the shape of the conductor.
Current-Carrying Conductor in Magnetic Field
When a current carrying conductor is placed in a uniform magnetic field, it experiences a force and the conductor starts rotating.
Current-Carrying Conductor
Consider a straight conductor carries a current of I ampere has an effective length of l metre. It is found that the force F on the conductor is given by V = I ´ R newtons
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