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a current passes through a wire of non-uniform cross-section.Which of the following quantities are independent of the cross section? (a) the charge crossing in a given time interval (b) drift speed (c) current density (d) free electron density pls give the reason too as to why each option is correct or wrong.

a current passes through a wire of non-uniform cross-section.Which of the following quantities are independent of the cross section?
(a) the charge crossing in a given time interval
(b) drift speed
(c) current density
(d) free electron density
pls give the reason too as to why each option is correct or wrong.

Grade:7

2 Answers

Sher Mohammad IIT Delhi
askIITians Faculty 174 Points
9 years ago
Current IN will always equal current OUT. In a wire, and electric current will not alter the balance of electrons and protons - well, there can be a slight shift, but a very VERY tiny and neglectable one - so you can assume that the number of electrons entering the wire is identical to the number leaving. That means the amount of current entering must always equal the amount leaving. This is the basic principle you should really think about and get to understand

sher mohammad
b.tech, iit delhi
PREETAM YADAV
15 Points
5 years ago
Pre-election density because When an electric current at the junction of two wires of the same material is directed from the thick wire to the thin wire, the drift speed of the electrons increase as they pass through the cross-section

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