Each of the resistances shown in figure (45-E2) has a value of $20 Ω .$ Find the equivalent resistance between A and B. Does it depend on whether the point A or B is at higher potential ?

In problems 25 to 30, assume that the resistance of each diode is zero in forward bias and is infinity in reverse bias.

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Solution

According to wheatstone bridge principle, there is no current through the diode.

Hence net resistance of the circuit is,

$\frac{40}{2} = 20 Ω$

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According to wheatstone bridge principle, there is no current through the diode. Hence net resistance of the circuit is, 402=20 Ω

According to wheatstone bridge principle, there is no current through the diode.

Hence net resistance of the circuit is,

$\frac{40}{2} = 20 Ω$