Q. 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: (iv) Can be RC or LCR circuit
E = E0 sinωt
I = I0 sin(ωt + π/3)
as I can lead the Voltage in RC and LCR circuit, so it can be RC or LCR circuit. (iv) is correct option.