Kirchhoff's junction rule states that the algebraic sum of currents entering and leaving a junction is zero. This rule is a direct reflection of the conservation of charge (statement b), meaning charge cannot be created or destroyed at the junction. Consequently, in a steady current, the total charge entering per unit time must equal the total charge leaving, implying there is no accumulation of charges at the junction (statement d) . Statement (c) is incorrect because the momentum of a charged particle (a vector quantity) changes direction at a junction due to the electric field, so momentum is not conserved .