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  • A straight conductor of uniform cross section carries a current I. Let s be the specific charge of an electron. The momentum of all the free electrons per unit length of the conductor, due to

A straight conductor of uniform cross section carries a current I. Let s be the specific charge of an electron. The momentum of all the free electrons per unit length of the conductor, due to their drift velocities only, is

Option: 1

\mathrm{I \mathrm{~s}}


Option: 2

\mathrm{I / \mathrm{s}}


Option: 3

\mathrm{\sqrt{I / s}}


Option: 4

\mathrm{(I / s)^2}


Answers (1)

best_answer

I= Avne. Number. Of free electrons per unit length \mathrm{=1 \times A \times n}
Momentum of each free electron =m v
Therefore, momentum per unit length is
\mathrm{ \text { Anmv }=\frac{1}{e} m=\frac{I}{(e / m)}=\frac{I}{s} }

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