Physics · JEE | Alternating Current

Consider the following statements about circuit components in ac circuits: (I) The root mean square current \( I \) is related to peak current \( i_m \) by \( I = i_m/\sqrt{2} \). (II) The capacitive reactance is inversely proportional to both capacitance and frequency. (III) Inserting an iron rod into an open coil inductor increases its inductance and inductive reactance. (IV) The average power in a purely inductive circuit is non-zero. How many of the above statements are correct?

1. A
   Only two
2. B
   Only three
3. C
   All four
4. D
   Only one