A) Current, electric field and drift speed
B) Drift speed only
C) Current and drift speed
D) Current only
Correct Answer: D
Solution :
If E be electric field, then current density j = \[\sigma E\] Also we know that current density \[j=\frac{i}{A}\] Hence j is different for different area of cross-sections. When j is different, then E is also different. Thus E is not constant. The drift velocity \[{{v}_{d}}\]is given by \[{{v}_{d}}=\frac{j}{ne}\]= different for different j values. Hence only current i will be constant.
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