Case : Read the passage and answer the question(s).

Let us consider a straight conductor moving in a uniform and time-independent magnetic field. Figure shows a rectangular conductor PQRS in which the conductor PQ is free to move. The rod PQ is moved towards the left with a constant velocity v as shown in the figure. PQRS forms a closed circuit enclosing an area that changes as PQ moves. The length RQ = x and RS = l and the magnetic flux is Φ_B enclosed by the loop PQRS.

Which of the following is true?

There is no loss due to friction

It is one of the assumption that we do not consider friction.