question_answer 34)

  In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit? (a) Only resistor (b) Resistor and an inductor (c) Resistor and a capacitor (d) Only a capacitor.

Answer:

  (c,d)The reactance of a capacitor is On increasing the frequency  ; decreases. Therefore, current increases. As R does not vary with frequency, therefore, likely elements constituting the circuit may be capacitor only or capacitor and a resistor. Choices (c) and (d) are correct.