Kirchhoff's junction rule is a reflection of: (a) conservation of the current density vector. (b) conservation of charge. (c) the fact that the momentum with which a charged particle approaches a junction is unchanged (as a vector) as the charged particle leaves the junction. (d) the fact that there is no accumulation of charges at a junction.
Which of the above statements are correct?
(b) and (c)
(a) and (c)
(b) and (d)
(c) and (d)
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 .
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