(a) (i) A straight cylindrical conductor is suspended with its axis perpendicular to the magnetic field of a…
(a) (i) A straight cylindrical conductor is suspended with its axis perpendicular to the magnetic field of a horse-shoe magnet. The conductor gets displaced towards left when a current is passed through it. What will happen to the displacement of the conductor if the
(1) current through it is increased ?
(2) horse-shoe magnet is replaced by another stronger horse-shoe magnet ?
(3) direction of current through it is reversed ?
(ii) Name and state the rule for determining the direction of force on a current carrying conductor in a magnetic field.
Solution
(a) (i) (1) Increased.
(2) Increased.
(3) The direction of displacement is reversed.
(ii) *Flemings left-hand rule
*According to this rule, stretch the thumb, forefinger and middle finger of 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.
[Alternate answer of the statement: diagram of left hand showing Field, Current and Force/Motion mutually perpendicular. All the physical quantities mentioned in the diagram should be perpendicular to each other.]