Question
In Fig., assuming the diodes to be ideal:
✓
Answer
A symbol of the diode is represented like this : In this problem first we have to check the polarity of the diodes. $-10$ is the lower voltage in the circuit.
Now $p-$side of $p-n$ juction $D_1$ is connected to lower voltage and $n-$side of $D_1$ to higher voltage.
Thus $D_1$ is reverse biased.
Now, let us analyse $2^{nd}$ diode of the given circuit.
The $p-$side of $p-n$ junction $D_1$ is at higher potential and $n-$side of $D_2$ is at lower potential.
Therefore $D_2$ is forward biased.
Hence, current flows through the jucntion from $B$ to $A$.
Now $p-$side of $p-n$ juction $D_1$ is connected to lower voltage and $n-$side of $D_1$ to higher voltage.
Thus $D_1$ is reverse biased.
Now, let us analyse $2^{nd}$ diode of the given circuit.
The $p-$side of $p-n$ junction $D_1$ is at higher potential and $n-$side of $D_2$ is at lower potential.
Therefore $D_2$ is forward biased.
Hence, current flows through the jucntion from $B$ to $A$.
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