Physics Electrostatics Level: High School
The electric field E is zero at all points on a closed surface ; is there necessarily no net charge with in the surface ? If a surface encloses zero net charge , is the electric field necessarily zero at all points on the surface ?
Physics Electrostatics Level: High School
What can you say about the flux through a closed surface that encloses an electric dipole ?
Physics Electrostatics Level: High School
Is the electric field E in Gauss’s law , integral E. dA = charge enclosed / epsilon naught , that due only to the charge enclose ?
Physics Electrostatics Level: High School
An electron is released from rest in a uniform electric field and acceleration to the north at a rate of 145 m/s^2 . What is the magnitude and direction of the electric field ?
Physics Electrostatics Level: High School
What is the magnitude and direction of the electric field 20.0 cm directly above an isolated 33.0 x 10^-6C charge ?
Physics Electrostatics Level: High School
What is the magnitude of the acceleration experienced by an electron in an electric field of 600 N/C ? How does the direction of the acceleration depend on the direction of the field at that point ?
Physics Electrostatics Level: High School
Compare the electric force holding the electron in orbit (r = 0.53 x 10^-10 m) around the proton nucleus of the hydrogen atom, with the gravitational force between the same electron and proton . What is the ratio of these two forces ?
Physics Electrostatics Level: High School
A charge of 6.00 mC is placed at each corner of a square 0.100m on a side . Determine the magnitude and direction of the force on each charge .
Physics Electrostatics Level: High School
A person scuffing her feet on a wool rug on a dry day accumulate the net charges of -40 microC. How many excess electrons does this person get , and byA how much does her mass increase ?
Physics Electrostatics Level: High School
Two charged balls are 15cm apart . They are moved and the force on each of them is found to have been tripled , How far apart are they now ?
Physics Electrostatics Level: High School
What is the repulsive electrical force between two protons in a nucleus that are 5.0 x 10^-15m apart from each other ?
Physics Electrostatics Level: High School
How many electrons make up a charge of -30.0 micro C ?
Physics Electrostatics Level: High School
The diagram at “click here” use electric charges to move the 1000 kg object up a 30 degree frictionless ramp . Place equal and opposite charges on the object and at the top of the 5.0m ramp .(a) What magnitude charges are needed to keep the object from moving
(b) What is the initial energy of the object ? (Define zeros for potential energy)
(c) How much work does it take to separate the two charges from 5.0m apart to infinity ?
Physics Electrostatics Level: High School
Identical positive charges , each of magnitude 2.0 micro C equally spaced along a circle of radius .20 cm which lies in the y-z plane as shown in the figure at “click here’(a) Determine the electric field at a point , P , 1.0m away from the center of the circle along the x axis.
(b) Find the electric potential at the point P
(c) What is the electric field at the centre of the circle ?
(d) What is the potential at the center of the circle ?
(e) Consider a similar arrangement of charges but there are now only N of them equal-spaced along the same circle N is a large integer . Each charge now has a charge q1 = (+2.0 micro C)/N where N is the same large integer , What is the E field at point P now ?
Physics Electrostatics Level: High School
The figure which is shown at “click here” shows the electric field lines for two point charges separated by a small distance .(a) Determine the ration q1/q2 ,/p>
(b) What are the signs of q1 and q2 ?
