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# The diode connected in forward bias has zero resistance and if connected in reverse biase has infinity resistance Find the effective resistance across A and B the given circuit.

$(a)\;10\;\Omega \\ (b)\;zero \\ (c)\;infinity \\ (d)\;20\; \Omega$

According to Wheatstone principle there is no current through the diode.
Therefore the effective resistence is $10 \Omega$
Hence a is the correct answer.
edited Jul 14, 2014