Five current carrying conductors meet at point P. What is the magnitude and direction of the current in…
Five current carrying conductors meet at point P. What is the magnitude and direction of the current in conductor PQ?
$1 \mathrm{~A}$ form $\mathrm{Q}$ to $\mathrm{P}$
$1 \mathrm{~A}$ form $\mathrm{P}$ to $\mathrm{Q}$
$3 \mathrm{~A}$ form $\mathrm{p}$ to $\mathrm{Q}$
$2 \mathrm{~A}$ form $\mathrm{Q}$ to $\mathrm{P}$
Solution
According to Kirchhoff's first law, at point $\mathrm{P}$, $\begin{array}{ll} & 5 \mathrm{~A}+4 \mathrm{~A}+\mathrm{I}-5 \mathrm{~A}-3 \mathrm{~A}=0 \\ \therefore \quad & \mathrm{I}=-1 \mathrm{~A} \\ \therefore \quad & 1 \mathrm{~A} \text { current flows from } \mathrm{P} \text { to } \mathrm{Q} .\end{array}$
