JEE Main 2014 · 11 Apr · Shift 1 · Physics Q28 · Dronacharya Exams

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PhysicsSingle correct+4 / -1Question 28 of 90

A Zener diode is connected to a battery and a load as shown below :

The currents I, $I_Z$ and $I_L$ are respectively

A 60 V battery drives current I through a 4 kΩ resistor to node A. From A, a Zener diode (V_Z = 10 V, current I_Z) goes down to B, and the load R_L = 2 kΩ (current I_L) is in parallel with the Zener.

A

15 mA, 5 mA, 10 mA

B

15 mA, 7.5 mA, 7.5 mA

C

12.5 mA, 5 mA, 7.5 mA

D

12.5 mA, 7.5 mA, 5 mA

Answer and worked solution

Official answer: D

The Zener holds the load at 10 V:

$I_L=\dfrac{10}{2000}=5$ mA;
$I=\dfrac{60-10}{4000}=12.5$ mA;
$I_Z=12.5-5=7.5$ mA.

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

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