question_answer

Kirchhoffs first law, \[i.,e.,\Sigma i=0\] at a junction, deals with the conservation of:

A) angular momentum

B) linear momentum

C) energy

D) charge

Correct Answer: D

Solution :

Kirchhoffs law states that, the algebraic sum of currents meet at a point (say junction) equals to zero i.e.,        \[\Sigma i=0\] or          \[i={{i}_{1}}={{i}_{2}}={{i}_{3}}\] In other words when a steady current flows through circuit, then neither accumulation of charges takes place at the junction in the circuit nor any charge is removed from there. Thats why Kirchhoffs first law deals with the conservation of charge. NOTE: Similarly Kirchhcffs second law \[(\Sigma V=\Sigma ir)\] is based on conservation of energy.