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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) charge crossing in a given time interval (b) drift speed (c) current density (d) free electron density also give the reason as to why each option is right 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) charge crossing in a given time interval
(b) drift speed
(c) current density
(d) free electron density
also give the reason as to why each option is right or wrong.

Grade:12

1 Answers

Nirmal Singh.
askIITians Faculty 44 Points
10 years ago
Its is independent of free electron density.
because we know that
J = I /A = neVd
Where J = current density,
A = cross section area
n = no. of electrons
e = charge of electrons
ne = charge crossing in a given time interval
Vd = drift velocity
Thanks & Regards,
Nirmal Singh
Askiitians Faculty

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