Which option explains the rule to understand the working of motor? (a) When a current carrying conductor is moved with a force, it creates the magnetic field.
(b) When a conductor is moved inside a magnetic field, current is produced in the conductor.
(c) When magnetic field is moved relative to the conductor, current is produced in the conductor.
(d) When a current carrying conductor placed in a magnetic field, it experiences a force by
magnetic field.

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?