Three infinitely long wires with linear charge density λ are placed along the 
axis and z-axis respectively. Which of the following denotes an equipotential surface?
constant 
constant 
constant 
Text Solution
Verified by ExpertsC
Potential due to an infinite wire is 
, where r is the distance from the wire.
Taking the point in space 
Distance from wire along x-axis is 
Distance from wire along y-axis is 
Distance from wire along z-axis is 
Potential at P due to wire along x-axis is
Potential at P due to wire along y-axis is
Potential at P due to wire along z-axis is
Not potential at 
or 
i.e. 
or
For equipotential surface
constant
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