Ten identical cells each of potential ' E ' and internal resistance ' r ' are connected in series to form a closed circuit. An ideal voltmeter connected across three cells, will read
Text Solution
Verified by ExpertsThe correct answer is:
D
Given: Initial number of cells 
;
Potential of each cell 
;
Internal resistance of each cell 
and final number of cells 
.
We know from the Ohm's law, total voltage of ten cells 
and total resistance in ten cells 
.
Therefore current in the circuit, 
or
Potential difference across three cells 
(Since the voltmeter is ideal, therefore it will read 
).
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