alleryStart learning →For an infinitely long line charge, how does the field vary with distance r from the wire?
AIt varies as 1/r
BIt varies as 1/r^2
CIt varies as 1/r^3
DIt stays constant
Answer & Solution
Correct answer: A. It varies as 1/r
The flux through the cylinder of area 2 pi r l gives E = lambda/(2 pi e0 r), so E falls as 1/r.
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