Two generators use the same magnetic field and operate at the same frequency. each has a single-turn circular coil. one generator has a coil radius of 5.1 cm and a peak emf of 1.8 v. the other generator has a peak emf of 3.9 v. find the coil radius r of this other generator.

The radius of the second coil will be 7.5 cm

Explanation:

We have given that radius of the first coil

Peak emf of the first generator

Peak emf of the second generator

We know that induced emf is rate of change of magnetic flux , that is equal to magnetic field multiply by change in area

So emf will be proportional to the change in area

So

So the radius of the second coil will be 7.5 cm

c. newton's third law of motion