The circuit shown below is working as a $8 V$ dc regulated voltage source. When $16 V$ is used as input, the power dissipated ( $in m W$ ) in each diode is; (considering both Zener diodes are identical) _____

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answer is B.

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Detailed Solution

Current in the circuit, $I = \frac{16 - 8}{400} = 2 \times 10^{- 2} A$
Power dissipated in each diode, P = VI
$\Rightarrow P = 4 \times 2 \times 10^{- 2} = 80 mW$

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