A current is flowing through a conductor with non-uniform area of cross-section.

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Question
A current is flowing through a conductor with non-uniform area of cross-section. Then
Options
A. current will be different at different cross-sections.
B. current will be the same at all the cross-sections.
C. current will be different but current density will be same at all the cross-sections
D. current will be the same but current density will be different at different cross-sections.

Correct Answer

current will be the same but current density will be different at different cross-sections.

Explanation

Current density = current/area of cross-section. Same current throughout the conductor.

Since, area of cross-section is non-uniform, current density will be different at different cross-sections.

1. Match the following:

3. Match the following:

	List I		List II
A.	p type semiconductor	1.	silicon
B.	n type semiconductor	2.	holes are majority carriers
C.	Intrinsic semiconductor	3.	electrons are majority carriers
D.	Tungsten	4.	is a metal

4. When temperature is above ferromagnetic Curie temperature, a ferromagnetic material
Options
A. becomes a paramagnetic material
B. becomes a very strong ferromagnetic material
C. becomes diamagnetic material
D. none of the above

8. Consider the probability density f(x) = ae^-b|x| where x is a random variable whose allowable values range from x = - ? to x = + ?. P(1 ? x ? 2)
Options
A.
B.
C.
D. (e^-b - e^-2b)