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1. How many excess electrons are there in a typical lightning bolt that has about 16 C of charge?
2. Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1,2), (2,4) and (4,1) show electrostatic attraction. Pairs (2, 3) and (4, 5) show repulsion, so ball 1 must be: (picture #1 attached)
3. A balloon, when rubbed against denim, gains a charge of -10μC. The force between the balloon and the denim when they are separated by a distance of 5 cm is: (add attractive or repulsive)
4. Two point charges +4q and +q are placed 30 cm apart. At what point on the line joining them is the electric field zero?
15 CM FROM Q
7.5 CM FROM Q
20 CM FROM 4Q
5 CM FROM Q
5. Two electrostatic point charges of +30 μC and +25 μC exert a repulsive force of 200 N on each other. What is the distance between the two charges?
6. Four charges are placed at the four corners of a square of side 15 cm. The charges on the upper left and right corners are +3 µC and -6 µC respectively. The charges on the lower left and right corners are -2.4 µC and -9 µC respectively. The net electric force on -6 µC charge is: (picture #2 attached)
25 N, 780 above the -ve x- axis
25 N, 780 below the -ve x- axis
13 N, 310 below the +ve x- axis
18 N, 750 above the +ve x- axis
7. A charge q1 = 5 μC, is at the origin. A second charge q2 = -3 μC is on the x-axis 0.8 m from the origin. The electric field at a point on the y-axis 0.5 m from the origin is:
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