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KCET 2022 Physics Solved Paper
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© examsnet.com
Question : 15
Total: 60
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
13
E
7
E
10
E
3
E
Validate
Solution:
10 identical cells connected in series.
Potential of each cell
=
E
Internal resistance of each cell
=
r
Total voltage of ten cells
=
10
E
Total resistance of ten cells
=
10
r
Current in the circuit,
I
=
10
E
10
r
=
E
r
Potentiol difference across 3 cells,
V
=
I
×
3
r
=
E
2
×
3
r
=
3
E
Hence, ideal voltmeter will read
3
E
.
© examsnet.com
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