KVPY SA Exam 2018 Question Paper

Question : 26 of 80

Marks: +1, -0

A steady current I is set up in a wire whose cross-sectional area decreases in the direction of the flow of the current. Then, as we examine the narrowing region

the current density decreases in value
the magnitude of the electric field increases
the current density remains constant
the average speed of the moving charges remains constant

Validate

Solution:

\I = \neAv_\d

J=\I/\A=σE

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