Answer the following: a) A certain metal cable has a resistance R, and we have another cable of the same material with the same length, but twice its diameter. The resistance of the second wire will be: a) 1/4 R b) 1/2 R c) 2 R d) 4 R b) The resistance of a conductive material does not depend on its: a) mass b) long c) Sectional area d) resistivity e) temperature c) Which of the following combinations of length and sectional area for a certain copper cable will have the least resistance: a) L and A b) 2L and 1/2 A c) 1/2 L and 2A d) It does not matter because the volume of copper re

#4 & #5

In Figure 06, the space between the coaxial metal cylinders of length 1 = 50 cm and radii a = 1.5 cm, b = 2.5 cm is completely filled with a material of electrical resistivity p = 30.2m (k=10³) 1) Finding the Electrical Resistance Between the Lateral Surfaces of the Cylinders a)4,08 A b)4,28 A _c)4,48 A d)4,68 A e)4,88 A II) Finding the Electrical Resistance Between the Ends of the Cylinders a)11,1 ΚΩ b)11,3ΚΩ c)11,5ΚΩ d)11,7ΚΩ e)11,9ΚΩ III) Find the intensity of electric current between the cylinders, if the potential difference between them is V=10 volts, for case I) a)2,05 A b)2,15 A c)2,25 A Р d)2,35 A H Fig.06 e)2,45 A

A uniform conductor of length Į and cross-sectional area A. When the cross-sectional area decreases, its resistance O a. increases O b. decreases O. remains constant d. may increase or decrease