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Reverse Bias

For the circu...

Question

For the circuit shown in the figure. The equivalent resistance between point A and B for the two cases (i) $V_{A} > V_{B}$ (ii) $V_{B} > V_{A}$ respectively is _ $Ω$ and __ $Ω$ respectively ( $D_{1}$ and $D_{2}$ are ideal diodes)

25, \infty

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50, \infty

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\infty, 25

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50, 50

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Solution

The correct option is B $25, \infty$
For $V_{A} > V_{B}$
Both diodes are forward biased
so equivalent resistance will be the parallel connection of the resistances.
$R_{e q} = \frac{R_{1} R_{2}}{R_{1} + R_{2}}$

Substitute the values:
$R_{1} = \frac{50 \times 50}{50 + 50} = 25 Ω$

If $V_{A} < V_{B}$

Both of the diodes are reverse biased and they will not let the circuit to be closed.
Therefore, the equivalent resistance of the equivalent circuit will be infinity

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For the circuit shown in the figure. The equivalent resistance between point A and B for the two cases (i)VA>VB (ii) VB>VArespectively is _______ Ω and ________ Ω respectively (D1 and D2 are ideal diodes)

For the circuit shown in the figure. The equivalent resistance between point A and B for the two cases (i) $V_{A} > V_{B}$ (ii) $V_{B} > V_{A}$ respectively is _ $Ω$ and __ $Ω$ respectively ( $D_{1}$ and $D_{2}$ are ideal diodes)