A rod between the poles of a horse-shoe magnet: what happens when current flows, and the rule
The same question, asked 4 times: 2022*, 2023*, 2025*, 2026. Every wording below, oldest first.
Try each one first, then open its answer.
Question 1
2022
2As shown in the diagram an aluminium rod ‘AB’ is suspended horizontally between the two poles of a strong horse shoe magent in such a way that the axis of rod is horizontal and the direction of the magnetic field is vertically upward. The rod is connected in series with a battery and a key. State giving reason : (a) What is observed when a current is passed through the aluminum rod from end B to end A ? (b) What change is observed in a situation in which the axis of the rod ‘AB’ is moved and aligned parallel to the magnetic field and current is passed in the rod in the same direction ?Question 2
2023
32 (a)(i) A straight cylindrical conductor is suspended with its axis perpendicular to the magnetic field of a horse-shoe magnet. The conductor gets displaced towards left when a current is passed through it. What will happen to the displacement of the conductor if the (1) current through it is increased ? (2) horse-shoe magnet is replaced by another stronger horse-shoe magnet ? (3) direction of current through it is reversed ? (ii) Name and state the rule for determining the direction of force on a current carrying conductor in a magnetic field.Question 3
2025
36 (B)(i) By using the given experimental set-up. How can it be shown that : (a) a force is exerted on the current-carrying conductor AB when it is placed in a magnetic field. (b) the direction of force can be reversed in two ways. (ii) When will the magnitude of the force be highest? (iii) State Fleming’s left hand rule.Question 4
2026
37On the basis of the given circuit arrangement, answer the following questions : (a) What happens to the rod AB when the key K is closed and why ? (b) Name and state the rule that determines this behaviour of the rod AB in the above situation.