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The diode is called an electronic valve ...

The diode is called an electronic valve since

A

it permits the flow of electric current only in one direction from cathode to anode.

B

it permits the flow of electric current only in one direction from anode to cathode in external circuit.

C

it permits current in both directions.

D

it permits the flow of electric current in any direction.

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The correct Answer is:
A
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