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In the given circuit, potential barriers developed across diode is $0.5 v$ . Find the current in the circuit.

$(a)\;40\;m\;A \\ (b)\;20\;m\;A \\ (c)\;60\;m\;A \\ (d)\;100\;m\;A$

Can you answer this question?

Since potential barriers of $0.5 \;v$ develops across diode the effective voltage is
$V= 4.5 -0.5 =4v$
$R= 100r$
$I= \large\frac{V}{R}=\frac{4}{100}$
$\quad= 0.04 A$
$\quad= 40\;mA$
Hence a is the correct answer
answered Jan 27, 2014 by