Find the current flowing through a copper wire of length 0.2m, area of cross-section `1 mm^(2)`, when connected to a battery of 4 V. Given that electron mobility `=4.5xx10^(-6) m^(2)V^(-1) s^(-1)` and charge on electron `=1.6xx10^(-19)C`. The number density of electron in copper is `8.5 xx10^(28) m^(-3)`.

Find the current flowing through a copper wire of length 0.2m, area of

1.	Find the current flowing through a copper wire of length 0.2m, area of cross-section `1 mm^(2)`, when connected to a battery of 4 V. Given that electron mobility `=4.5xx10^(-6) m^(2)V^(-1) s^(-1)` and charge on electron `=1.6xx10^(-19)C`. The number density of electron in copper is `8.5 xx10^(28) m^(-3)`.
Answer» Correct Answer - `1.22 A` `I = n A e upsilon_(d) = n A e mu E = n= n A e mu (V)/(l)` `= (8.5 xx 10^(28)) xx (10^(-3))^(2) xx (1.6 xx 10^(-19)) xx (4.5 xx 10^(-6)) xx (4)/(0.2)` `= 1.22 A`

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