Surface Charge Density
The normal of a spherical surface is r^. Just inside the surface, the electric field is E,in = 15 N/C r^ and just outside the surface the electric field is Eout = -25 N/C r^. What is the surface charge density of surface?
Charge
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Draw the electric field using arrows on a square grid
For some configuration of charge, the electric force on a positive charge is F(x) = gamma |x| x hat, where gamma is a constant. Draw the electric field using arrows on a square grid with 16 points placed symmetrically about the y-axis.
What is the exposure to a beam of rays (in roentgens)?
A beam of rays passes through 4.0e-3 kg of dry air and generates 1.6e12 ions, each with a charge of +e. What is the exposure (in roentgens)?
Relationship of Forces
With respects to forces, how are electric charge and mass alike? How are they different? I am not sure but does this have anything to do with Coulomb's Law??
The Net Electric Field
Question: Two charges, -18 and +4.0 microcoulombs, are fixed in place and separated by 3.0 meters. At what spot along a line through the charges is the net electric field zero? Locate this spot relative to the positive charge. Let the positive charge be at x=0 and the negative charge be at x=3.0 meters. Make sure the answer is i
Elecrostatic force
An equilateral triangle has sides of 0.12 meters. Charges of -8.6, +8.0 and +1.6 micro Coulombs are located at the corners of the triangle. Find the magnitude of the net electrostatic force exerted on the 1.6 micro Coulomb charge.
Find Magnitude of Net Torque
A long, thin rod (length = 3.5 meters) lies along the x axis, with its midpoint at the origin. In a vacuum, a +7.0 micro Coulombs point charge is fixed to one end of the rod, while a -7.0 micro Coloumb point charge is fixed to the other end. Everywhere in the x, y plane there is a constant external electric field (magnitude = 4.
Electrostatic Force Protons
If the electrostatic force between two protons is equal to 1X10^-7 Newtons, what is the distance between them?
2 neutrons proton and neutron, electron and neutron
Find the magnitude of the electrostatic force of 1)two neutrons separated by 2X10^6m, 2) a proton and a neutron separated by 2X10^6m, 3) and an electron and a neutron separated by 2x10^6m.
Electricity: Lightening lasts 0.05 seconds with flow of 100 C
A lightening stroke lasts 0.05 seconds and involves a flow of 100 C. What is the current?
Electricity Identical Masses
Two identical +7.5e-6 point charges are intially spaced 5.5cm from each other. If they are realesed at the same instant from rest, how fast will they be moving when they are very far away from each other? Assume they have identical masses of 1.0 mg.
Amount of water ionized in lightning
Background: A strong lighting bolt transfers an electric charge of about 28 degree C to earth. The total electrons transferred in the process are 1.7478e20. (Assuming one mole of water has a mass of 17.9g/mol). Question: If each water molecule donates one electron, how much water (in units g) is ionized in the lighting?
Energy stored in a charged capacitor
Calculate the heat generated when a condenser of 100µF capacity and charged to 200 volts is discharged through a 2 ohm resistance.
Electrostatic Repulsion Maximums
A certain charge Q is divided into two parts q and Q-q. How the charges Q and q must be related so that when q and (Q-q) placed at a certain distance apart experience maximum electrostatic repulsion.
Calculation of force on a small charge element
An electric charge Q is uniformly distributed over the surface of a sphere of radius r.Show that the force on a small charge element dq is radial and outward and is given by dF=1/2 Edq, where, E=1/(4 Pi Epsilon_0)(Q/r^2) is the electric field at the surface of the sphere.