Answer:
From the circuit diagram, we have
IbR1 + Vbe = Vbb
Expression for the base current gives us
Ib = Vbb – Vbe/R1
It can be seen that Ib is inversely proportional to R1
The reading of the ammeter lowers as the resistance R1 is increased because less current flows through it. Similarly, as the current traveling through R2 drops in amplitude, the voltmeter reading lowers.