Charging (Basics)
What fundamental particle is exchanged in electrical processes
electrons
An atom has a total charge of +14e. If it has 19 protons, how many electrons does it have?
5
What is the Unit of the electric field
N/C
A surface encloses a +7 micro-coulomb charge, a -9.6 micro-coulomb charge, and an unknown charge. If the net electric flux through the surface is zero, what is the third charge in micro-coulombs? Include a negative sign if it's negative.
+ 2.6 micro C
What does it mean when an object is electrically negative
It has more electrons than protons.
Object 1 has a total charge of +15 e and object 2 has a total charge of -13 e. They are involved in a charging process and object 1 gives 3 electrons to object 2. What is the total charge of object 1 in terms of e now?
+18 e
The test charge is always
postive
A charge of +19.4 micro-coulombs is placed at x = +27.8 cm, y = 0 cm. What is the y component of the electric field at the origin (x = y = 0) in 106 N/C?
2.257 x 106
What is the formula for Coulomb's Law?
F = (k |q1 q2|) / r2
A charge of +8 micro-coulombs with a mass of 0.7 kg is placed on a horizontal surface and another charge of +14 micro-coulombs is placed 0.7 meters directly above this charge. What is the amount of normal force acting on the charge on the surface in Newtons?
8.922 N
The direction of the electric field for a single negative charge
the field points TOWARDS the charge
Two Charges are along the x-axis: charge 1 is -5 microC at x= 0m and charge 2 is +8 microC at X= -3 m. Where exactly on the electric field from the two charges equal to zero?
14.35m
What are the three methods of chargings?
Physical contact, Friction, and Induction
Charge 1 of +7 micro-coulombs is located at the origin, charge 2 of -9 micro-coulombs is located at x = 0 cm, y = -14 cm, and charge 3 of +8.5 micro-coulombs is located at x = -12 cm, y = 0 cm. What is the direction of the total electric force on charge 1 measured counter-clockwise from the +x axis, in degrees?
323.13
What is the formula for Electric Field
E = (k |q|)/r2
A positive charge of 12 micro-coulombs with some mass is placed on a string and placed in a uniform electric field of 57.5 x 106 N/C in the -x direction. It swings to an angle of 33 degrees with the vertical before coming to equilibrium. What is the amount (magnitude) of tension in the string in Newtons?
1266.89 N
The unit of electrical charge, e, is equal to:
e = 1.60 x 10-19 C
A charge, q1, with a mass of 7 kg is hanging vertically from a string. Another charge, q2, is placed directly below it a distance, d, below the charge on the string and the tension in string is zero. Then q2 is moved a factor of 1.4 times further from the charge on the string, and another charge which is 3 times larger than q2 and the same sign as q2 is placed a distance d to the right of the charge on the string (it's place as far away as where q2 was originally). What is the magnitude of the tension of the string in equilibrium now, in Newtons?
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WHat is the relationship between the electric field and the distance between the point and charge
the field produced is directly proportional to the inverse of the radius squared or the field produced is inversely proportional to the square of the radius
A charge of +19 micro-coulombs with a mass of 1.8 kg is placed on a horizontal surface with a coefficient of static friction of 1.2. Directly above this charge is an equal charge (held still). A uniform electric field of 4.7 x 106 N/C is directed in the +x direction, parallel to the surface. At this magnitude, it just begins to move the charge on the surface (overcomes friction). How far apart, in centimeters, are the two charges?
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