A) parallel plate capacitor.
B) spherical capacitor.
C) paper capacitor.
D) electrolytic capacitor.
Correct Answer: A
Solution :
Option [a] is correct. Explanation: Capacitor used in old radio is a parallel plate capacitor It consists of two sets of parallel circular plates, one of which can rotate manually by means of a knob. The rotation causes overlapping areas of plates to change, thus changing its capacitance.
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