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Series Combination of Cells

In the follow...

Question

In the following circuit, the reading of the voltmeter will be (in volt) :-

A

7.2

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B

4.8

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C

6

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D

4

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Solution

The correct option is A $7.2$
V=IR= $\frac{ρ l}{a}$
V is directly proportional to length
$\frac{V_{1}}{V_{2}}$ = $\frac{l_{1}}{l_{2}}$
$\frac{4.8}{V_{2}}$ = $\frac{40}{60}$
$V_{2} = 7.2 V$

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