Two power supplies, one of constant emf 24 volt and the other of variable emf P, are connected to

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Two power supplies, one of constant emf 24 volt and the other of variable emf P, are connected to two resistors as shown. Both spwer supplies have negligible internal resistances. What is the magnitude of P for the reading on the ammeter to be zero? Links:
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Legendary man. Where in india are you based in?

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