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A 20 V battery of internal resistance 1 ...

A 20 V battery of internal resistance `1 Omega` is connected to three coils of `12Omega, 6 Omega, and 4Omega` in parallel, a resistor of `5 Omega` and a reversed battery (emf 8 V and internal resistance 2 Omega) as shown in fig Calculate

a. the current in the circuit,
b. current in resistor of `12 Omega` coil, and
c. potential difference across each battery.

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