Answer:
The
experimental set-up comprises of three resistors 
and 
which are joined in
parallel combination and connecting them with a battery, an ammeter (A), a
voltmeter (V) and a plug key K, as shown in figure (a).
The key K is closed and the voltmeter and ammeter readings are recorded.
The key K is open and removing the ammeter and voltmeter
from the circuit and insert the voltmeter V in parallel with 
and ammeter in
series with the resistor ,
as shown in fig. (b)Again, the voltmeter and ammeter readings are recorded.
Similarly, measuring the potential differences across
resistances
and . It is found that voltmeter
gives identical reading which leads to conclude that the voltage or potential difference
across each resistors is same and equal to the potential difference across the combination
.
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