Question

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

Answer 1

Force `(F)` acting on a conductor of length (l) carrying current (I) placed in a magnetic field `(B)` is given by
`F=IlB`
(i) If the current (I) in the rod AB is increased, F also increases.
(ii) When a stronger horse-shoe magnet is used, B increases. On account of this F also increases.
(iii) If the length (l) of the rod is increased, F also increases.