Oh my gosh had the same question
Electric<span> current produces a magnetic field. This magnetic field can be visualized as a pattern of circular field lines surrounding a wire. One way to explore the direction of a magnetic field is with a </span>compass, as shown by a long straight current-carrying wire<span> in.
Hope this helps,
kwrob</span>
The answer that will fill in the blank is the texture gradient. This describes the things seen far from where you are standing, in which it points its different in size and the way how they look denser. It enables the person to give a sense of depth perception because of how the person sees in which it depends on how far or how the person sees it.
Focal distance of an ellipse is given by the formula
here a = length of semi major axis
e = eccentricity of the path
now here we know that
length of major axis for the path of planet is given as 32 units
so here we can say
so length of semi major axis is 16 units
focal distance for the planet path is given as 8 units
now from the above formula we can write
so eccentricity for the path of planet will be 0.5