Q63 / 90 · JEE Main 2017 (08 Apr Online) · Physics

The $V - I$ characteristic of a diode is shown in the figure. The ratio of forward to reverse bias resistance is:

A
$100$
B
$10^{6}$
Correct answer
C
$10^{- 6}$
D
$10$

Solution

Forward bias resistance

R_{1} = \frac{0.8 - 0.7}{(20 - 10) \times 10^{- 3}} = \frac{0.1}{10 \times 10^{- 3}} = 10 Ω

.

Reverse bias resistance

R_{2} = \frac{10}{10^{- 6}} = 10^{7} Ω

.

\frac{R_{1}}{R_{2}} = 10^{- 6}

.

Hence, the correct answer is option: 'C'.

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