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Electric Potential and Potential Difference

If 3 A of c...

Question

If $3 A$ of current is flowing between points $P$ and $Q$ in the circuit, then the potential difference between $P$ and $Q$ is.

A

30 V

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B

22 V

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C

20 V

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D

15 V

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Solution

The correct option is C $20 V$
By using the formula ,
$V_{Q} - V_{P} = Σ ε - Σ i R$
or $V_{Q} - V_{P} = - 2 - (3 \times 2 + 3 \times 4)$
or $V_{Q} - V_{P} = - 2 - 18 = - 20 V$
or $V_{P} - V_{Q} = 20 V$

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