Magnetic Effect of Electric Current Part-2

Magnetic Field through Current Carrying loop:

It is represented by concentric circle at every point. Circle will become larger and larger as one move away.

Factors affecting magnetic field of a circular current carrying conductor

  • Magnetic field is directly proportional to the current passing through the conductor.
  • Magnetic field is inversely proportional to the distance from the conductor.
  • Magnetic field is directly proportional to number of turns in coil.


Magnetic field lines through Solenoid:

Solenoid is defined as coil of many circular turns of insulated copper wire wrapped closely in a cylindrical form. Magnetic field of solenoid is similar to bar magnet.



Left hand Fleming rule:

According to this rule, stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of current, then the thumb will point in the direction of motion or the force acting on the conductor.

Electromagnetic Induction:

  • The process, by which a changing magnetic field in a conductor induces a current another conductor is called Electromagnetic Induction.

Left hand Fleming Rule:

Stretch the thumb, forefinger and middle finger of right hand so that they are perpendicular to each other. If the forefinger indicates the direction of the magnetic field and the thumb shows the direction of motion of conductor, then the middle finger will show the direction of induced current. This simple rule is called Fleming’s right-hand rule.