Three charges, 1 nC, 3 nC and -2 nC are located in a two-dimensional plane with the following coordinates (in meters), respectively: (0,0), (3,0) and (3,4). Calculate the following: a. the resultant force at each of the charges b. the potential at pt. (0,4)
Three charges, 1 nC, 3 nC and -2 nC are located in a two-dimensional plane with the following coordinates (in meters), respectively: (0,0), (3,0) and (3,4). Calculate the following: a. the resultant force at each of the charges b. the potential at pt. (0,4)
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Transcribed Image Text:1. Three charges, 1 nC, 3 nC and -2 nC are located in a two-dimensional plane with
the following coordinates (in meters), respectively: (0,0), (3,0) and (3,4).
Calculate the following:
a. the resultant force at each of the charges
b. the potential at pt. (0,4)
c. the electric field at pt. (0,4)
2. A 1.5-m wire measuring 1.5 m³ has a resistance of 0.955-µN at 20 °C. Calculate
the resistance of the wire at 20 °C if the length is changed to 150-m and its area
to 450-cm2.
3. A 1-km cable consists of 12 identical strands of aluminum, each 3mm in
diameter. What is the resistance of the cable? (Hint: the 12 strands resemble 12
resistances in parallel, each resistance being the resistance of each strand).
4. A conductor has a resistance of 7-2 at 0°C. At 20 °C, its temperature coefficient
is 0.00333. Find its resistance at 10 °C.
5. An electric heater takes 23.889 kcal in 20 minutes at 200 V. What is the current
drawn by the heater? (Hint: 4.186 J = 1 cal)
%3D
6. How many electrons pass in a given point in 40 seconds in a conductor carrying
10 Amperes?
7. Two resistors in series rated 4 Q and 6 Q are connected in parallel with a 10 Q
resistor. The total parallel combination is connected in series with a 7 Q resistor
and the whole circuit is supplied by a 12-V battery. Determine the following: a.
The total resistance
b. The total current
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