Q. 2. In Activity 13.7, how do we think the displacement of rod AB will be affected if
(iii) length of the rod AB is increased?
When a current-carrying wire is placed in the magnetic field, it experiences a force,
this force is proportional to the length of wire, the strength of the magnetic field and the current through the wire.
And hence When the length of the rod AB is increased, it will experience a greater force and hence will be more displaced.