A zener diode, having breakdown voltage equal to \( 15 \mathrm{~V} ...

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A zener diode, having breakdown voltage equal to \( 15 \mathrm{~V} \), is used in a voltage regulator circuit shown in figure. The current through the diode is
(a) \( 10 \mathrm{~mA} \)
(b) \( 15 \mathrm{~mA} \)
(c) \( 20 \mathrm{~mA} \)
(d) \( 5 \mathrm{~mA} \)
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