Question

A generator is constructed by rotating a coil of N turns in a magnetic field B at a frequency f. The internal resistance of the coil is R and the cross sectional area of the coil is A.
Which of the following statements are true? (Give ALL correct answers, i.e., B, AC, BCD...)

A) The maximum induced EMF doubles if the frequency f is doubled.
B) The maximum induced EMF doubles if the magnetic field B is doubled.
C) The maximum induced EMF occurs when the coil is rotated about an axis parallel to the magnetic field lines.
D) The maximum induced EMF doubles if the area A is doubled.
E) The maximum induced EMF doubles if the resistance R is doubled.
F) The maximum induced EMF occurs when the coil is rotated about an axis normal to the plane of the coil.

Answer 1

Here ,

for a generator ,

the maximum induced EMF = 2*pi*f*A*N * B

where B is the magnetic field anf f is the frequency of rotation of coils

Now, the correct choices are

A) The maximum induced EMF doubles if the frequency f is doubled.
B) The maximum induced EMF doubles if the magnetic field B is doubled.
D) The maximum induced EMF doubles if the area A is doubled.
F) The maximum induced EMF occurs when the coil is rotated about an axis normal to the plane of the coil.