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Kirchhoff's Junction Law

The figure be...

Question

The figure below shows currents in a part of electric circuit. The current $i$ is

A

1.7 a m p

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B

3.7 a m p

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C

1.3 a m p

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D

1 a m p

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Solution

The correct option is C $1.7 a m p$
According to Kirchhoff's first law
At junction $A, i_{A B} = 2 + 2 = 4 A$
At junction $B, i_{A B} = i_{B C} - 1 = 3 A$
At junction $C, i = i_{B C} - 1.3 = 3 - 1.3 = 1.7 a m p$

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