A) direct current
B) alternating current
C) direct as well as alternating current
D) none of the above
Correct Answer: A
Solution :
Capacitors are the most widely used electronic components. They allow alternating current or signals and block the direct current. Capacitive reactance is given by \[{{\chi }_{C}}=\frac{1}{\omega C}\] For direct current \[\omega =2\pi f=0\] Hence, \[{{X}_{C}}=\infty \] Therefore, capacitor of fens infinite resistance to direct current and hence, acts as perfect insulator.
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