How does the dc current gain of a transistor change, if the width of the base region is increased?

The collector current in a transistor changes from 1.5 mA to 3.5 mA when the base current is changed from 20 muA to 60muA . Find the current gain.

How does the conductivity of a semi- conductor change with rise of temperature?

How does the density of a body change with temperature ?

The ac current gain in a transistor in CE mode is 120. What is the change in the collector current in the transistor whose base current changes by 100 muA ?

Explain the physical proces on the basis of which the r.m.s value of AC is defined? Derive the expression for r.m.s value of an alternating voltage. How does the value of Capacitative voltage. How does the value of Capacitative reactance of a capacitor change with the frequecny of the applied alternating e.m.f across it.

In a transistor, the base current is changed by 20muA . This results in a change of 0.02V in base emitter voltage and a change of 2mA in the collector current. .If the transistor is used as an amplifier with load resistance of 5KΩ .Find its voltage gain.

How does the force of gravitation between two objets change when the distance between them is reduced to half?