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  4. In the following circuit, the current flowing through 1 kΩ resistor is

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Q. In the following circuit, the current flowing through $ 1\,k\Omega $ resistor isPhysics Question Image

KEAMKEAM 2009

Solution:

Voltage across zener diode will always constant.
$ V=IR $
$ \therefore $ $ 5=I\times {{10}^{3}} $
Or $ I=\frac{5}{{{10}^{3}}} $
Or $ I=5\times {{10}^{-3}} $
Or $ I=5\,mA $