A current passes through a wire of non-uniform crosssection. Which of the following quantities are independent of the cross-section?
The charge crossing in a given time interval
Current density
Drift speed
Free-electron density
A
The charge crossing in a given time interval
B
Current density
C
Free-electron density
D
Drift speed
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Solution
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By conservation of charge and continuity equation, the current is same throughout a wire. Because current is defined as the charge crossing in a given time interval, option A is correct.
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