# NCERT Physics Class 12 Exemplar Ch 14 Semiconductor Electronics Materials Devices and Simple Circuits Part 4

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31 If each diode in Fig. has a forward bias resistance of and infinite resistance in reverse bias, what will be the values of the current?

Ans:

• is zero as the diode in that branch is reverse bised. Resistance in the branch AB and EF are each

• As AB and EF are identical parallel branches, their effective resistance is

• Net resistance in the circuit

• Current

• As resistances of AB and EF are equal, and

Q 32 In the circuit shown in Fig., when the input voltage of the base resistance is, is zero and is also zero. Find the values of.

Ans:

As , potential drop across is .

Since, potential drop across , i.e. is .

Q 33 Draw the output signals and in the given combination of gates (Fig.).

Ans:

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