JEE Main 2022 · 30 Jun · Shift 1 · Physics Q60

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PhysicsInteger+4 / -1Question 60 of 90

The circuit diagram used to study the characteristic curve of a zener diode is connected to variable power supply (0 - 15 V) as shown in figure. A zener diode with maximum potential $V_z=10$ V and maximum power dissipation of 0.4 W is connected across a potential divider arrangement. The value of resistance $R_P$ connected in series with the zener diode to protect it from the damage is ______ $\Omega$ .

Zener characteristic circuit: a variable supply E with key feeds a rheostat Rh used as a potential divider; from it, R_P in series with a reverse-biased zener (voltmeter V_z across it) and a microammeter.

Your answer

Answer and worked solution

Official answer: 125

Maximum current $\frac{0.4}{10}=40$ mA; at 15 V, $R_P=\frac{15-10}{0.04}=125$ Ω.

Answer: 125

Topics:Diode and Zener characteristics Special diodes (LED, Zener, photodiode, solar cell)

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JEE Main 2022 · 30 Jun · Shift 1, Physics question 60