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Electric & Magnetic Fields

The Electric Field Strength With Different Masses

Please help with the following problem. Provide step by step calculations. An object with a charge of -3.6 micro C and a mass of 0.012 kg experiences an upward electric force, due to a uniform electric field, equal in magnitude to its weight. (a) Find the direction and magnitude of the electric field. (b) If the electric ch

Surface density; Dipole moment

5. a) What is the dipole moment? 6. a) What is the surface charge density b) What is the electric field in terms of ... at the surface. Please see attachment complete questions diagrams.

Conducting Plate

Question: The value of the electric potential is given for each plate. Rank the pairs according to the magnitude of the electric field between the plates, least to greatest. 1. -20 V | | +70 V 2. +20 V | | +70 V 3. -10 V | | +90 V 4. +30 V | | +90 V

Conducting spheres, electric potential, charge density

Please show all work and show all equations used and diagrams. 1) Two conducting spheres are far apart. The smaller sphere carries a total charge of 6*10^-8C. The larger sphere has a radius that is twice that of the saler and is neutral. After the two spheres are conected by a conducting wire, the charges on the smaller and

Magnitude of the electric field; distribution of the charge

Please show all work and show all equations used and diagrams. 1) Positive charge Q is distriibuted uniformally throughout an insulating sphere of radius R, centered at the origin. A particle with a positive charge Q is placed at x = 2R on the x axis. The magnitude of the electric field at x =R/2 on the x axis is: 2) Cha

Force and Dipole Moment

Please show all work and diagrams plus equations used to solve problem. Thanks! 1) A 200-N/C electric field is in the positive x direction. The force on an electron in this field is: a) 200 N in the +x direction. b) 200 N in the -X direction. c) 3.2*10^-17 m/s^2 in the +x direction d)3.2*10^-17 m/s^2 in the -x directi

Charges and Electric Fields

Please show all work and diagrams plus equations used to solve problem. Thanks! 1) Experimentor A uses a test charge qsub0 and experimentor B uses a test charge 2qsub0 to measure an electric field produced by stationary charges. A finds a field that is: ans: The same as the field around B - WHY? 2) An isolated point

Total Charge on Gaussian Surface Cube

See attachment for diagram and background. (a) Determine the total charge on the surface of the spherical cavity. (b) Determine the total charge on the outer surface of the cube.

Electrons and Electric Fields

An electron (mass = 9.1 x 10^-31 kg and charge = -1.60 x 10^-19 C) is initially at rest just to the right of the leftmost plate. The separation between the two plates is 4.00 cm. A uniform electric field of 5000 N/C directed to the left is suddenly applied between the two plates. A) What is the force on the electron? B) What kin

Finding an Electric Field

A pair of parallel plates are separated by 1.0mm of air. If the plates are changed to a potential difference of 75 V, what is the electric field between the plates?

Electric Field Problem

A proton is moving parallel to a uniform electric field. The electric field accelerates the proton and increases its linear momentum to 5.0 10-23 kg m/s from 1.5 10-23 kg m/s in a time of 6.0 10-6 s. What is the magnitude of the electric field?

Electric Potential

What is the electric potential at a distance 0.25 m away from a point charge of 1.0 x 10^-9 C? How much work is required to bring an identical charge from very far away up to this distance of 0.25 m from the first charge? Please show work with correct answer.

Magnetization problem.

Why do we need to take the derivative of Log(Z_N) with respect to beta when computing the magnetization?

Electric Fields

1. A point charge q produces an electric field of magnitude 90.5 N/C at a distance of 1.68 m. If the field is directed towards the charge, what is the value of q? 2. When the plates of a radio capacitor are charged with 0.18 mC, the potential between them is 9.0 V. What is the capacitance? 3. A pair of parallel plates is s

Calculate the electric field everywhere.

A spherically symmetric charge density occupies the region r<a. The charge density increases with radius as rho(r)=(rho,o)r^2 where rho,o is a constant. Calculate the electric field everywhere.

Electrical potential energy

Hi. Can someone please tell me if I've gotten the right answer to this problem? A computer monitor accelerates electrons and directs them to the screen in order to create an image. If the accelerating plates are 1.2 cm apart, and have a potential difference of 25,000 V, what is the magnitude of the uniform electric field betw

Inductance of a short coil

I have the inductance of the long coil which is L=( Meu (not)* N^2 * A ) / (D) A = Area , D = Length , N = number of turns in the coil I need to prove that for a short coil the inductance (L) is the following: L =[( Meu (not)* N^2 * A ) / (D)] * [ [{(D^2 - a^2)^(1/2)} - a ] / (D)] ] a = radius of the coil A = 3.14 a^

Dipole and work

How much work is done moving a unit positive charge form 1 point of a triangle to another in the field of a dipole p? The triangle has the angles 45,45,90 with a base of length a. The dipole is located at the right base corner pointing in the -x direction. The positive unit charge has to be moved from the left corner to the t

Perturbation Theory with Atoms

See attachment for better symbol representation. When an atom is placed in a uniform external electric field Eext, the energy levels are shifted - a phenomenon known as the stark effect. In this problem we analyze the stark effect for the n=1 and n=2 states of hydrogen. Let the field point in the z direction, so the potent

Magnetic Force

A wire 2.80 m in length carries a current of 5.00 A in a region where a uniform magnetic field has a magnitude of 0.390 T. Calculate the magnitude of the magnetic force on the wire assuming the angle between the magnetic field and the current is (a) 60.0, (b) 90.0, (c) 120.

Magnetic Field Strength

A piece of copper wire has a resistance per unit length of 6.45E-3 omega/m. The wire is wound into a thin, flat coil of many turns that has a radius of 0.170 m. The ends of the wire are connected to a 12.0 V battery. Find the magnetic field strength at the center of the coil. Answer in T.

Answers in AmE2 and Nm

A circular coil of wire has a radius of 0.14 m. The coil has 80 turns and a current of 15 A, and is placed in a magnetic field whose magnitude is 0.30T. Determine the moment and maximum torque it can experience.

Question about Potential Difference

A uniform electric field of magnitude 250 V/m is directed in the positive x direction. A +12.0 micro coloumb charge moves from the origin to the point (x, y) = (20.0 cm, 50.0 cm). a) What is the change in the potential energy of the charge-field system? b) Through what potential difference does the charge move?

Physics - Electric Field

Electric Field Four identical point charges (q = + 10.0 micro coulomb) are located on the corners of a rectangle. The dimensions of the rectangle are L = 60.0 cm and W = 15.0 cm. Calculate the magnitude and direction of the resultant electric force exerted on the charge at the lower left corner by the other three charges.

Electric Force

Three charges are placed on the x and y axes as follows:+2q at the origin (0,0); -q at (a,0); +q at (0,a). Find the magnitude and direction of the electric field at the point (a/2,a/2), mid-way between the +q and -q charges.