In a common emitter transistor circuit, a bulb B and a volmeter V are connected as shown in Fig.What change would take place in bulb B and volmeter V when the value of resistance R is increased?

Explanation

When the value of resistance R is increased, the current in the input circuit decreases and heance emitter current `I_(e)` decreases. Due to it, the collector current `I_c (=I_(e)-I_b)` decreases. As a result of it, the bulb B glows dim. The decrease in the input current can be interpreted as the decrease in the base emitter volltage `(V_(BE))`. If V is the voltage across the collector-base circuit then in a closed circuit.
`V_(C C)=V+V_(BE)`
or `V=V_(C C)-V_(BE)`
When `V_(BE)` decreases V increases. It means voltage will show higher voltage.