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JEE Main 2015 (11 Apr, Shift 1) · Special Purpose Diodes

Special Purpose Diodes question from JEE Main 2015 (11 Apr, Shift 1)

Q88JEE Main 2015 · 11 APR · SHIFT 1Medium

Special Purpose Diodes

The value of the resistor, RS, needed in the dc voltage regulator circuit shown here, equals:

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Answer: (c)

Drop across $R_S$ : $V_i - V_L$
Current through $R_S$ : $I = I_Z + I_L = nI_L + I_L = (n+1)I_L$
$R_S = \frac{V_i - V_L}{(n+1)I_L}$
So the answer is (c).

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