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What is the equivalent resistance between points a and b in the figure?

Physics

What is the equivalent resistance between points a and b in the figure?

pur-new-sol

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30 and 45 are in parallel

30*45/(30+45)=18 ohms

18 and 42 are in series

18+42=60 ohms

60 and 40 ohms are in parallel ,so equivalent resistance

1/Req =1/40 + 1/60

Req=24 ohms