1.

At room temperature, copper has free electron density of \[8.4\times {{10}^{28}}\] per \[{{m}^{3}}\].  The copper conductor has a cross-section of \[{{10}^{6}}{{m}^{2}}\]and carries a current of 5.4 A.  The electron drift velocity in copper is                                            [UPSEAT 2002]

A.            400 m/s
B.                                      0.4 m/s
C.            0.4 m/s                                   
D.            72 m/s
Answer» D.            72 m/s


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