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
(C) An emf can be induced by changing the electric field
(D) An emf can be induced by moving a conductor in an electric field

Choose the correct answer from the options given below:

(A) and (B) only

The correct answer is Option (2) → (A) and (B) only

(A) An emf can be induced by moving a conductor in a magnetic field. This statement is correct. When a conductor moves through a magnetic field, it cuts magnetic field lines and an emf is induced. This is called motional emf.

(B) An emf can be induced by changing the magnetic field. This statement is correct. According to Faraday's Law of Electromagnetic Induction, any change in the magnetic environment of a coil of wire will cause an EMF to be "induced" in the coil. This change can be produced by changing the magnetic field strength over time.

(C) An emf can be induced by changing the electric field. This statement is incorrect. In the context of classical electromagnetic induction, a changing electric field does not induce an EMF. While Maxwell's equations show that a changing electric field creates a magnetic field (displacement current), the direct mechanism for inducing EMF in a circuit is a changing magnetic flux.

(D) An emf can be induced by moving a conductor in an electric field. This statement is incorrect. Moving a conductor in an electric field does not produce induced emf by electromagnetic induction, because induced emf is associated with changing magnetic flux.