lines that all the points on it have the same head pressure and eqipotential lines are always prependicular to the stream lines .
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I am not sure what situation you are talking about; usually such curves should be smooth.
concentric spherical surfaces
As we know equipotential surface means there is no potential difference that is no work is done on surface.so lines of force must intersect surface at right angles to satisfy this statement,so that net work is zero.
A uniform electric field exists between parallel plates of equal but opposite charges.
An object is said to be in uniform motion when it goes in a constant straight line. Motion is the part of the mechanics branch of physics.