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Physics-

General

Easy

Question

A current of 2A flows in an electric circuit as shown in figure. The potential difference $left parenthesis V subscript R end subscript minus V subscript S end subscript right parenthesis$ , in volts( $V subscript R end subscript minus V subscript S end subscript$ are potentials at R and S respectively) is

-4
+2
+4
-2

The correct answer is: +4

Current through each arm
PRQ and PSQ=1A
$V subscript p end subscript minus V subscript R end subscript equals 3 v$
$V subscript p end subscript minus V subscript s end subscript equals 7 V$
From Eqs. (i) and (ii), we get
$V subscript R end subscript minus V subscript s end subscript equals plus 4 V$

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