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

Question

A potential divider circuit is connected with a dc source of

20 \mathrm{~V}

, a light emitting diode of glow in voltage

1.8 \mathrm{~V}

and a zener diode of breakdown voltage of

3.2 \mathrm{~V}

. The length (PR) of the resistive wire is

20 \mathrm{~cm}

. The minimum length of PQ to just glow the LED is _____

\mathrm{cm}

Quantrex Academy · Accepted Answer

Correct answer: 0

aligned & PR=20 ~cm & ~V_ PQ =(1)/(4) × R_ PR & _ (PQ)=(1)/(4) × 20 & =5 ~cm aligned

A potential divider circuit is connected with a dc source of 20 ~V...