1. The figure down below shows a circut with five lights that are connected to a
ID: 1509941 • Letter: 1
Question
1. The figure down below shows a circut with five lights that are connected to a battery. assume that you place a probe of a voltmeter at the point marked with a dot. How many unique voltage differences can you measure by placing the second probe in the different wires in the circit? Draw a painting and select which regions that give rise to the different voltage differences
2. Two small identical spherical conductors are 0.6m apart from each other, together they have 200x10^-6 C. They repel each other with a force of 120N.
a) calculate the charge on each conductor
b) the two conductors are brought together so electrical contact is made and then divided so that it's 100x10^-6 C on each conductor. calculate the force on the conductor in addition to the second conductor when they are 0.6m apart.
3. Calculate the flows to both the magnitude and directions of all the oppositions in the figure bellow. You must therefor calculate three streams
Explanation / Answer
2.
r = distance between spheres = 0.6 m
Q1 = charge on first sphere
Q2 = charge on first sphere
Q1 + Q2 = 200 x 10-6 Eq-1
F = force of repelsion = 120 N
F = k Q1 Q2 /r2
120 = (9 x 109) Q1 Q2 /(0.6)2
Q1 Q2 = 4.8 x 10-9 Eq-2
using eq-1 and eq-2
Q1 (200 x 10-6 - Q1) = 4.8 x 10-9
Q1 = 2.8 x 10-5
Q2 = 17.2 x 10-5
b)
F' = new force = k Q2/r2 = (9 x 109) (100 x 10-6)2 /(0.6)2 = 250 N
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