Which of the following devices does not allow d.c. to pass through?
A
Resistor
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B
Capacitor
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C
Inductor
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D
All of these
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Solution
The correct option is B Capacitor A capacitor allows only alternating current (a.c.) to pass through it but not the direct current (d.c) whereas resistor and inductor allow both a.c. and d.c to pass through them.