(i) A current carrying conductor has a magnetic field associated with it. The two magnetic fields, one due to the magnet and the other due to the current in the conductor, interact. This produces a force on the conductor.
(ii) The direction of the magnetic force depends on
(a) the strength of electric current, and
(b) the strength of the magnetic field.
(iii) Fleming’s left hand rule is used for determination of the direction of magnetic force on a current carrying conductor.
(iv) Fleming’s left hand rule: Stretch the forefinger, the central finger and the thumb of the left hand mutually perpendicular to each other. If the forefinger points in the direction of the magnetic field, the central finger in the direction of current, then the thumb. points in the direction of force on the conductor.
What is an electromagnet? On factors does the strength of an electromagnet depend?
Or
What is an electromagnet? Draw a circuit diagram to show how a soft iron piece can be transformed into an electromagnet.
