1. a thin wire of length 2.0 m is uniformly charged and has a total charge of 40
ID: 1370676 • Letter: 1
Question
1. a thin wire of length 2.0 m is uniformly charged and has a total charge of 40 nC. What is the approximate magnitude of the electric field at a perpendicular distance of 6 cm from midpoint of the wire? (HINT: the distance from the wire is much less than the length of the wire.)
a) 12 kN/C b) 9.0 kN/C c) 8.0 d) 7.2 e) 6.0
2. A long clylinder of radius R>1 cm carries a uniform volume charge density p = 18 uC/m^3. Calculate the electric field at distance r=1 cm from the axis of the cylinder.
a) 14.7 kN/C b) 15.9 kN/C c) 10.2 kN/C d) 11.3 kN/C e) 13.0 kN/C
3. How much work has to be done to bring three charges +4 uC, -2 uC, +5 uC from infinity to the vertices of an equilateral triangle with sides of 6.5 mm?
a) 2.4 J b) 5.33 J c) 1.89 J d) 2.12 J e) 2.77 J
Explanation / Answer
1. a thin wire of length 2.0 m is uniformly charged and has a total charge of 40
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