## F.Sc ICS Notes: Physics XII: Chapter 18 Electronics Numerical Problems

__The current flowing into the base of a transistor is 100 micro Ampere. Find its collector current Ic. its emitter current Te and the ratio Ic/Ie, if the value of current gain β is 100.__

**Numerical Problem: 18.1**__Figure on book shows a transistor which operates a relay as the switch S is closed. The relay is energized by a current of 10m A. Calculate the value Rg which will just make the relay operate . The current gain β of the transistor is 200. When the transistor conducts, its Vbe can be assumed to 0.6 Volt.__

**Numerical Problem: 18.2**__In circuit shown on the book figure, there is negligible potential drop between B and E, where is β is 100, calculate:__

**Numerical Problem: 18.3****(i)**base current

**(ii)**collector current

**(iii)**potential drop across Rc

**(iv)**Vce

__Calculate the output of the op-amp circuit shown in figure on book.__

**Numerical Problem: 18.4**__Calculate the gain of the non-inverting amplifier as in figure on book.__

**Numerical Problem: 18.5**__Calculate the gain of an amplifier in which the collector resistance Rc is 5 kilo Ohm. The input resistance between the base and emitter of a typical transistor is 2.5 kilo Ohm and the value of its β = 100.__

**Numerical Problem: 18.6**
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