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In the given diagram resistance of each diode in forward bias is zero and infinity in reverse bias . If a 2V battery is connected as shown in circuit What is the effective current.

$(a)\;2A \\ (b)\;0A \\ (c)\;3.1 \;\Omega \\ (d)\;none\;of\;the\;above $
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One of the diode is forward biased and another is reversed biased.
$\therefore $ effective resistance $= 1+ \infty$
effective current $=\large\frac{2}{1+\infty}$
$\qquad= 0A$
Hence b is the correct answer.
answered Jan 27, 2014 by meena.p

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