Each of the resistance shown in figure h...

Each of the resistance shown in figure has a value of `20 Omega`.Find the equivalent resistance between A and B.Does it depend on whether the point A or B is at higher potential ?
In problem 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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According to wheastatone bridge principal ,there is no current through the diode .Here net resaistance of the circuit is,
`(40)/(2) = 20 Omega`

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