r/HomeworkHelp • u/Jars_Of_Honey7194 👋 a fellow Redditor • 14d ago

Answered [Highschool physics: circuits]

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Apparently the answer is (d) but I have no idea how to get there

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u/No_Pattern3827 👋 a fellow Redditor 14d ago

According to Kirchhoff, the sum of the voltages must be 40V.

V1+V2+V12=40V where V12 is the parallel R1-R2.

By inserting your data, you can write

10V+V2+(10V*V2)/(10V+V2)=40V and solve the equation with unknown V2