Kirchhoff current law at a junction is a statement of
A{'text': 'Conservation of energy', 'label': 'A'}
B{'text': 'Conservation of charge', 'label': 'B'}
C{'text': 'Conservation of momentum', 'label': 'C'}
D{'text': 'Newton second law', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Conservation of charge', 'label': 'B'}
1. KCL states that the algebraic sum of currents at any junction is zero.
2. This ensures no accumulation of charge at any node.
3. It is a direct expression of the principle of conservation of electric charge.
4. Conservation of energy underlies the voltage law (KVL) around a loop, not KCL.
_Source: NCERT Class 12 Physics, Ch 3 "Current Electricity", §3 Kirchhoff laws_
Related questions
For a battery of emf ε and internal resistance r driving current I through external resistA galvanometer of resistance G is converted into a voltmeter reading full-scale voltage V A galvanometer of resistance G shows full-scale deflection at current I_g. To convert it iThe relation between current density j, drift velocity v_d, number density n and charge e A wire has a resistance R. It is stretched uniformly so that its length becomes 2L. The neTwo cells of emf ε and internal resistance r each are connected in parallel. The equivalenA potentiometer of length L is used to compare emfs. If the balance lengths for cells of eIn a Wheatstone bridge, arms have resistances P, Q, R, S in cyclic order with a galvanomet