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Combination of Resistances

A current of ...

Question

A current of $2 A$ flows in an electric circuit as shown in figure. The potential difference $(V_{R} - V_{S})$ , in volts ( $V_{R}$ and $V_{S}$ are potentials at $R$ and $S$ respectively) is:

A

- 4

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B

+ 2

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C

+ 4

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D

- 2

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Solution

The correct option is C $+ 4$
Current through each arm
$P R Q$ and $P S Q = 1 A$
$V_{P} - V_{R} = 3 V$ ...(i)
$V_{P} - V_{S} = 7 V$ ...(ii)
From equations (i) and (ii), we get
$V_{R} - V_{S} = + 4 V$

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