A metal cable has radius r and is covered by insulation so that the distance from the

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A metal cable has radius r and is covered by insulation so that the distance from the center of the cable to the exterior of the insulation is R. The velocity v of an electrical impulse in the cable is where c is a positive constant. Find the following limits and interpret your answers.
(a)lim v R→r+ (b)

lim v r→0+

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