B

Step 1: Identify the phenomena in Column I and understand their corresponding machines/instruments in Column II.
(i) Electromagnetic induction is the principle behind transformers and generators, but here it is more closely associated with the function of a transformer rather than a DC motor.
(ii) The photoelectric effect refers to the emission of electrons when light shines on a material, which is the principle utilized in a photo cell. Hence, [B] is correct.
(iii) Mutual induction is a principle utilized in transformers and AC generators, but here it doesn't align precisely with the choices provided.
(iv) The torque on a current-carrying coil is typically associated with electric motors, particularly with a DC motor.
Thus, the correct pairing is (ii) Photoelectric effect - [B] Photo Cell.