Question

The instantaneous values of emf and the current in a series ac circuit are- 

E = Eo Sin ωt and I = Io sin(ωt+π/3) respectively, then it is 

(i) Necessarily a RL circuit 

(ii) Necessarily a RC circuit 

(iii)Necessarily a LCR circuit 

(iv) Can be RC or LCR circuit

Answer 1

Answer is (iv) Can be RC or LCR circuit

as I can lead the Voltage in RC and LCR circuit, so it can be RC or LCR circuit.