PHYS 142 Mid Tem Exam Fall Semester 2017 Nam lastructionse For problems where yo
ID: 1796437 • Letter: P
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PHYS 142 Mid Tem Exam Fall Semester 2017 Nam lastructionse For problems where yousced to write in answers, correct "nits (SI system) must aecompeay the·nits. Leaving ofr the units willeos, you L/3 rd the points for that aarwer.r the number is correct. 1) (7points). What is the magaitude of the electrie force of attraction nuclear (q47e) and its electron ar the distance of 1.8x10'"m? (q.ox10 ) (473LLGXIO 2) (12 points). Calculate the electric potential at poist A due to the two point charges, (f.ox1o"N·-% ) (. 75x6c)--Booooo c) ·2704 1 52 m h:V (.sccPHG10-NI..(.52cm 3) (7 points). How 110 V? id between two plates 4.3 mm apart if the potential difference between them is the 4) (10 points). A 0.15 F capacitor is desired. What arca must the plates have if they are to be separated by a 1.2 mm air gap? 5) (14 points). Calculate the resistance and peak current in a 500 W hair dryer connected to a 120 V AC electric line. 20 vysoows 21.8 ohns 6) (11 points). A bird stands on a de electric line carrying 1 700 A. The line has 1.3 x 10-5 resistance per meter and the bird's feet are 5.0 cm apart. What is the potential difference between the bird's feet? A 1n00 -1100 1.3 -0.0442 0.5Explanation / Answer
(1) F = Kq1q2/r^2
F = (9 x 10^9 x (47 x 1.6 x 10^-19) x 1.6 x 10^-19) / (1.8 x 10^-10)
F = 6.016 x 10-17 N
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