Consider the following statements:
(A) An emf can be induced by moving a conductor in a magnetic field.
(B) An emf can be induced by changing the magnetic field.
Formula used: emf is given by
Where v is the speed
B is the magnetic field
l is the length
That above formula states that an emf induced by moving a conductor of length l with some velocity v in a magnetic field B.
Where is the electric flux through the conductor
emf induced in the conductor
Formula (2) states that an emf can be induced by changing the magnetic field that causes the change in flux through a conductor in a loop.
So option A is the answer.