Directions: You may use an 8 X 11\" sheet with formulas but no worked problems.

Question

Directions: You may use an 8 X 11" sheet with formulas but no worked problems. You may also use a calculator (CAS and Graphics calculators are acceptable). You may bring a table of integrals/derivatives as well as trig identities. Show all work including equations used, substitutions, and steps to your final answer. Multiple choices questions graded both for the correct answer and for correct procedure. Partial credit may given. Try to work out problems with symbols for as long as is practical, but clearly define each symbol. Circle your final answer. Include units while working out the problem. Illegible work will not be graded. Clearly number each problem, and clearly number each page. Scratch paper may be used, but do not turn it in for grading. All problems have equal value. ALL CELL PHONES MUST BE OFF!!! If you need a break outside of the exam room, DO NOT take your ceil phone with you. will be l) A cylindrical wire of radius 2.0 mm carries a current of 2.5 A. The potential difference between points on the wire that are 46 m apart is 3.7 V (a) What is the electric field in the wire? (b) What is the resistivity of the material of which the wire is made?

Explanation / Answer

a) EF = V/r

= 3.7 / 0.002

= 1850 N/C

b) R =pL/A

(V/I) = pL/A

p = VA/IL

= 3.7*pi*(0.002)^2 / 2.5*46

= 4.04*10^-7 ohm - metre

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