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Correct option is D)

The resultant resistance of circuit is

**Therefore, the correct answer is D is $4V$.**

$⇒R_{eq}=2.5+2.5+5+25+15$

$⇒50Ω.$

The resultant e.m.f of the circuit is given by

$⇒ϵ=ϵ_{1}−ϵ_{2}$

$⇒10−5$

$⇒5$

In closed loop

According kirchhoff's Second law

$⇒$$10−2.5I−5I−2.5I−5−40I=0$

$⇒$$5−50I=0$

$⇒$$I=101 A$

$⇒$$V_{B}−V_{A}=101 ×40=4V$

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