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6.01 Quiz Physics-Electrostatics
Terms in this set (7)
How many excess electrons are there in a typical lightning bolt that has about 16 C of charge?
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
Two point charges +4q and +q are placed 30 cm apart. At what point on the line joining them is the electric field zero?
20cm from 4q
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?
F = kc
q2 / r²= 0.184m
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 -9 μC charge is what?
Charge at A = +3μC = 3 x 10-6 C
Charge at B = -6μC = -6 x 10-6 C
Charge at C = -2.4μC = -2.4 x 10-6 C
Charge at D = -9μC = -9 x 10-6 C
kc = 9 x 109 N*m2 /C2
AB = BD = CD = CA = r = 15 cm = 0.15 m
AD = √[(0.15)2 + (0.15)2] = 0.212 m
Force at B due to charge at D = (9 x 109 x 9 x 10-6 x 6 x 10-6) / (0.15)2 = 21.6 N along BD (along y-axis in the positive direction)
Force at B due to charge at A = (9 x 109 x 6 x 10-6 x 3 x 10-6) / (0.15)2= 7.2 N along AB (along x-axis in the negative direction)
Force at B due to charge at C = (9 x 109 x 2.4 x 10-6 x 6 x 10-6) / (0.212)2 = 2.88 N along BC
This makes an angle 450 with BA or BD.
This force can be split up into
(5.4 x sin45) = 2.04 N along BA in the positive direction and (5.4 x cos45) = 2.04 N along BD in the positive direction.
Total x-component = 7.2 - 2.04 = 5.16 N in the negative x-direction.
Total y- component = 21.6 + 2.04 = 23.64 N in the positive y-direction.
Resultant of x & y components = √ [(5.16)2 + (23.64)2 ]= 25 N
tanφ = 23.64 / 5.16 = 4.58, So, Φ = 780
25 N, 780 above the negative x- axis.
A hollow metal ball carrying an electric charge produces no electric charge at point
inside the ball
Which of the following is an insulator?
insulators are materials that impede the free flow of electrons from atom to atom and molecule to molecule=ebonite
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