Question

Q20. (i) What do we observe when current passes through the aluminium rod from B to A.
(a) The rod is not displaced.
(b) The rod is displaced towards the right.
(c) The rod is displaced towards the left.
(d) None of the above.​

Answer 1

We are asked the question as to what we observe when the current passes through the aluminum rod and the correct answer is c) The rod is displaced towards the left.

• We are given that there is a rod.
• When a current is passed through rod B To A, the displacement of the rod suggests that a force is exerted on the current-carrying aluminum rod when it is placed in a magnetic field.
• The direction of the force will also be reversed when the path or direction of the current which is passed through the conductor is reversed.
• So the rod is displaced towards the left because of the force exerted on it when there is a magnetic field around it.  
• Therefore, The correct option is option C which states that the rod is displaced towards the left.

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Answer 2

1. Take a small piece of aluminium rod AB.
2. Suspend it horizontally from a stand using two connecting wires, as shown in the figure.
3. Place a strong horseshoe magnet so that the rod is between the two poles and the magnetic field is pointing upwards.
4. Put the north pole of the magnet vertically below and the south pole vertically above the aluminium rod for this.
5. Connect the aluminium rod to a battery, a key, and a rheostat in series.
6. Now, conduct a current through the aluminium rod from end B to end A.
7. The rod is observed to be displaced to the left.
8. You will also notice that the rod shifts.

Hence, option c) is correct.

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