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A circuit consists of three batteries of...

A circuit consists of three batteries of emf `E_1 = 1 V, E_2 = 2 V and E_3 = 3 V` and internal resistances `1Omega, 2 Omega and 1 Omega` respectively which are connected in parallel as shown in the figure. The potential difference between points P and Q is

A

`1.0 V`

B

`2.0 V`

C

`2.2 V`

D

`3.0 V`

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