Question

Explain the following with reference to the magnetic field around a straight

conductor carrying current.

(i) Tracing the pattern of magnetic field

(ii) increasing the intensity of magnetic field

(iii) Reversing the direction of electric current​

Answer 1

The pattern of the magnetic field lines around a straight conductor carrying current can be described by the following activities

1. Insert vertically a long straight wire carrying an electric current so that it passes through the centre of a horizontal piece of plastic board as shown in the figure.
2. Take care that the plastic board is fixed and does not move up and down. Now, Sprinkle some iron filling into the plastic board to show the shape of the field.
3. You will notice that the I am feeling get arranged round the wires in the shape of the circle. This is due to the reason that the magnetic field lines around the current carrying straight conductor are circular. The iron fillings align among these field lines.
4. On reversing the direction of flow of current, we observe that the iron filings arrange themselves in circle around the wire showing that the magnetic field lines are still circular in nature. The direction of the magnetic field can be obtained by using a compress. if the current direction is reversed, the direction of the magnetic field is also reversed.

• When the current through the wire is decreased, field also gets reduced.
• When the current is reversed, field also gets reversed in direction.

Answer 2

Answer: The Magnetic field lines around a straight conductor carrying current are concentric circles whose centres lie on the wire. The direction of magnetic field lines can be determined using Right-Hand Thumb Rule.

Explanation: The pattern of the magnetic field lines around a straight conductor carrying current can be described by the following activities

• Insert vertically a long straight wire carrying an electric current so that it passes through the centre of a horizontal piece of plastic board as shown in the figure.

• Take care that the plastic board is fixed and does not move up and down. Now, Sprinkle some iron filling into the plastic board to show the shape of the field.

• You will notice that the I am feeling get arranged round the wires in the shape of the circle. This is due to the reason that the magnetic field lines around the current carrying straight conductor are circular. The iron fillings align among these field lines.

• On reversing the direction of flow of current, we observe that the iron filings arrange themselves in circle around the wire showing that the magnetic field lines are still circular in nature. The direction of the magnetic field can be obtained by using a compress. if the current direction is reversed, the direction of the magnetic field is also reversed.

• When the current through the wire is decreased, field also gets reduced.

• When the current is reversed, field also gets reversed in direction.

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