Solve.The length L of wire (in feet) that would have resistance R (in ohms) is given by 
where d is the diameter of the wire in thousandths of an inch (or mils) and K is the specific resistance of the material.(a) Solve this formula for R. (b) Substitute 
for R in your answer to part (a) and then solve for d. (c) Use your answer to part (b) to find the diameter of copper wire (K = 10.4 ohms) 1480 ft long if the current I is 12.0 amperes and the voltage drop E is 10.0 volts. (Round to the nearest whole number.)
A. (a) R = 
,
(b) d = 
,
(c) 128 mils
B. (a) R = 
,
(b) d = 
,
(c) 136 mils
C. (a) R = 
,
(b) d = 
,
(c) 18,470 mils
D. (a) R = 
,
(b) d = 
,
(c) 18,630 mils
Answer: B
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A. 
B. 
C. {6, -8}
D. 
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