Commercial electric motors do not use

For a current in a long straight solenoid N- and S-poles are created at the two ends. Among the following statements, the incorrect statement is

A uniform magnetic field exists in the plane of paper pointing from left to right as shown in Figure 13.3. In the field, an electron and a proton move as shown. The electron and the proton experience

In the arrangement shown in Figure 13.4 there are two coils wound on a non-conducting cylindrical rod. Initially the key is not inserted. Then the key is inserted and later removed. Then

Choose the incorrect statement