A long metal cylinder with radius a is supported on an insulating stand on the axis of a long, hollow, metal tube with radius b. The positive charge per unit length on the inner cylinder is and there is an equal negative charge per unit length on the outer cylinder. (a) take V=0 at r=a. Calculate the potential V(r) from (1) r b. (b) To calculate the electric field at any point between the cylinders, that is a

x=-2

infinite number of lines, so there is an infinite number of equations.

step-by-step explanation:

there are an infinite number of line that passes through the point (-2,5)

x=-2   is one line that passes through the point

y = 5 is another line that passes through the point

(these two lines are perpendicular to each other).

since the number of   numbers are infinite and the slope is the ratio of two numbers,(change in y over change in x) we can have an infinite number of slopes.     our only condition is that it passes through the point (-2,5)

its 50 miles away from the starting point

the answer is  

a.

4,624π mm2

step-by-step explanation: