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A potential divider circuit is connected with a dc source of 20 ~V , a light emitting diode of glow in voltage 1.8 ~V and a zener diode of breakdown voltage of 3.2 ~V . The length (PR) of the resistive wire is 20 ~cm . The minimum length of PQ to just glow the LED is _____ cm

Correct answer

0

Step-by-step solution

aligned & PR =20 ~cm & ~V _ PQ = 1 4 R _ PR & _ ( PQ )= 1 4 20 & =5 ~cm aligned

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