Question

How to do the experiment of the magnetic field on current carrying straight conductor

Answer 1

Objective:

To study the force on a current-carrying straight conductor in a magnetic field and to verify that the motion of the conductor is according to Fleming’s left-hand rule.

Theory:

A current carrying conductor placed in a magnetic field experiences a force. If the direction of the field and that of current are mutually perpendicular to each other, then the force acting on the conductor will be perpendicular to both and that can be determined using the Fleming’s left-hand rule. When current establishes in the conductor, it gets displaced which verifies the existence of a force on the conductor.  Hold the thumb and the first two fingers of your left hand mutually at right angles to each other as shown in Fig. (2). Then if the Forefinger points in the direction of the Field, and the second finger in the direction of the Current, the thumb will point in the direction of Force.

Answer 2

1)Take a battery,rheostat,an ammeter,a plug key and a long straight thick copper wire.

2)Insert the thick wire through the centre,normal to the plane of a rectangular cardboard.Take care cardboard is fixed and does not slide up or down.

3)Connect the copper wire vertically between the point X and Y in series with battery,plug and key.

4)Sprinkle some iron filling uniformly on the cardboard.

5)Keep the variable of the rheostat at a fixed position and note the current through the ammeter.

6)Close the key so that a current flows through the wire.Ensure that the copper wire placed between the points remain vertically straight.

7)Gently tap the cardboard a few times.Observe the pattern of the iron filling.They will show a pattern of concentric circles around the copper wire.

8)Place a compass at a point over a circle.Observe the direction of the needle.

9)The direction of the north pole of the compass needle would give the direction of the field lines produced by the electric current through the straight wire at point.


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