Question

. (a) A stationary charge is placed in a magnetic field. Will it experience a force? Give reason to justify your answer.
(b) On what factors does the direction of force experienced by a conductor when placed in a magnetic field depend ?
(c) Under what condition is the force experienced by a current-carrying conductor placed in a uniform magnetic field maximum ?
(d) Name and state the rule that gives the direction of force experienced by a current- carrying conductor placed in a magnetic field.


CBSE Class X Science SA 2 (3 Marks)

Answer 1

(a) No, a magnetic field exerts a force only on moving charges.  
(b) The direction of force depends on the direction of current and direction of the magnetic field.  
(c) The force is maximum when the direction of current is at right angles to the direction of the magnetic field.
(d) Fleming’s left hand rule : Stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular to each other. If the first finger points in the direction of the magnetic field and the middle finger in the direction of current, the thumb will point in the direction of motion or the force acting on the conductor

Answer 2

Answer:

(a) No, a magnetic field exerts a force only on moving charges.

(b) The direction of force depends on the direction of current and direction of magnetic field.

(c) The force is maximum when the direction of current is at right angles to the direction of magnetic field.

(d) Fleming's Left Hand Rule. According to this rule - "Stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular to each other. If the first finger points in the direction of magnetic field and the middle finger in the direction of currentthen the thumb will point in the direction of motion or the force acting on the conductor."