How do we think the displacement of rod AB will be affected if (i) current in rod AB is increased: (ii) a stronger horse-shoe magnet is used: and (iii) length of the rod AB is increased?

We have learnt that the force acted by a magnet on a current-carrying conductor depends on the following factors

  • Strength of the magnetic field
  • Amount of current flowing in the conductor
  • Length of the conductor

Explanation

When a current-carrying wire is fixed in the magnetic field, it undergoes a force. This force is proportional to the length of the wire, the strength of the magnetic field and current through the wire. Hence when a stronger horseshoe magnet has been used the strength of the magnetic field is high, and it will undergo a greater force and hence will be more displaced.

The displacement of the rod AB

The displacement of the rod AB will be affected in the following ways

(i) If the current in the rod is increased then the force in the rod will also increase. Then the rod will be deflected with greater force as the greater force leads to an increase in displacement as well.
(ii) If a stronger horse-shoe magnet is used then also rod will be deflected with greater force due to the increase in the magnetic field.
(iii) If the length of the rod AB is increased then the force exerted on the current-carrying conductor will also increase.

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