Current Electricity

Question: There is a current of 20 amperes in a copper wire of ${10^{ - 6}}$ square metre area of cross-section. If the number of free electrons per cubic metre is ${10^{29}}$, then the drift velocity is

1) $125\times10^{-3}m/sec$

2) $12.5\times10^{-3}m/sec$

3) $1.25\times10^{-3}m/sec$

4) $1.25\times10^{-4}m/sec$

Solution:

Explanation: No Explanation

Electric Conduction Ohm's Law Resistance

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