Share
Explore BrainMass

Electric & Magnetic Fields

Magnetic Field due to a Current.

The problem states: Two semicircular arcs have radii R2 = 7.80 cm and R1 = 3.15 cm, carry current i = 0.281 A, and share the same center of curvature C. What are the (a) magnitude and (b) direction (into or out of the page) of the net magnetic field?

Electrostatic Charges & Fields

Problem 13 :- In figure 21-26 in attached file 3 particle 1 of charge +1.0 uC and particle 2 of charge -3.0 uC are held at separation L = 10.0cm on an x axis. If particle 3 of unknown charge (q3) is to be located such that the net electrostatic force on it from particles1 and 2 is zero. What must be the (a)x axis and (b) y

Electric field due to a charged disc

A uniformly charged disk of radius 35.0 cm carries charge with a density of 7.90 x 10^-3 C/m^2. Calculate the electric field on the axis of the disk at (a) 5.0 cm, (b) 10.0 cm, (c) 50 cm and (d) 200 cm from the center of the disk.

Electric Field and Stored Energy of Parallel-Plate Capacitor

A parallel-plate capacitor with plate area of 2 m^2 and a separation of 1.0 mm is charged to 100 V. (a) What is the electric field between the plates? (b) what is the energy per unit volume in the space between the plates? (c) find the total energy by multiplying your answer from part (b) by the total volume between the

Electric field lines & equipotential lines

Draw a picture of the electric field lines generated by a collection of two positive charges, both of charge q = 1. Center one at (1,0) and the other rat (-1,0). What happens to the electric field at the origin? (the point 0,0) Draw a few equipotential lines. Remember, these are the curves that circle the charge distribut

Solve: Electric Potential Difference

Question: Two protons are moving directly towards one another. When they are very far apart, their initial speeds are 3.00 x 10^6 m/s. What is the distance of closest approach?

Electric Field & Magnitudes

The lines show the equipotential contours in the plane of three point charges, Q1, Q2, and Q3. The values of the potentials are in kV as indicated for the +5, 0, and -5 kV contours. The positions of the charges are indicated by the dots. the work required to move a charge of -0.51×10-12C from i to b is 3.06×10-9 J a: Ca

Expression Point Charges

y l l a (+q) l l -------l--------x l -a (+2q) l l Two point charges are fixed on the y-axis at the locations shown in the figure above. A charge of +q is located at y = a and a charge of +2q is located at y = -a. Express your answers to a an

Impossible electrostatic field, charges and work

See attached file for full problem description. 8. (a) Three charges are situated at the corners of a square (side a) as shown in Figure 2.41: (a) how much work does it take to bring in another charge, +q, from far away and place it in the fourth corner? (b) How much work does it take to assemble the whole configuration of

Electric Field, Radioactivity & X-Ray Wavelength

1. The drawing shows the potential at five points on a set of axes. Each of the four points is 7.0 x 10^-3 mt from the point of origin. From the data shown find the magnitude and the direction of electric field in the vicinity of origin. (See attached for diagram) 2. A 0.5 kg tumor is being irradiated by a radioactive sou

Parallel plates capacitor

Two parallel plates are .005m apart and are each 2m2 in area. The plates are in vacuum and an electric potential difference of 10,000V is applied across them. 1) Find the: a)capacitance, b)the charge on each plate c)the electric field intensity in the space between, and d) the stored energy. 2) If a dielectric mater

Circuits

See attached file for full problem description. Three point charges are located along the circle of radius. Derive the expression for the electric field in the center.

Electromagnetic Waves and Electric Fields

Suppose a plane electromagnetic wave has a wavelength of 50 m and the electric field vibrates with an amplitude of 22 V/m. Calculate the frequency of the wave, the amplitude of B. Write an expression for B in a the form B=Bo cos(kx-w(omega)t) with numerical values for B0, k, and w. See attachment for better formula representatio

Force on a current carrying conductor due to magnetic field.

In this problem i am not sure if you can just use the right hand screw rule The cube is 40 cm on each edge. Four straight segments of wire - ab, bc, cd, and da - form a closed loop that carries a current I = 5 A, in the direction shown. The loop is placed in a uniform magnetic field of magnitude B = 0.020 T in the positive y

Mutual inductance and inductance of a transformer primary

1) How would you arrange two flat circular coils so that their mutual inductance was a) greatest b) least (without separating them by a great distance)? 2) If you are given a wire of such length that you can make only two loops out of it, how would you shape this wire to obtain a) the greatest; b) the least self-inductance?

Conductor with varying cross section areas

Suppose that a current-carrying ohmic metal wire has a cross-sectional area that gradually becomes smaller from one end of the wire to the other. How do drift velocity, current density, and electric field vary along the wire? Please explain with the help of equations to support explanation.

Magnetic field at the core of a solenoid

A solenoid that is 75 cm long produces a magnetic field of 2.1 T within its core when it carries a current of 6.8 A. How many turns of wire are contained in this solenoid?

Electromagnetism: Force on moving charge in a magnetic field

1. In an experiment with cosmic rays, a vertical beam of particle that have charge of magnitude 3e and mass 12 times the proton mass enters a uniform horizontal magnetic field at 0.250 T and is bent in a semicircle of diameter 95.0 cm a) Find the speed of the particles and the sign of their charge. b) Is it reasonable to ignor

Consider an extended one-dimensional rod of length L and charge Q uniformly distributed. Determine the field from the rod at a point P a distance y from its center perpendicular to the rod.

I'm taking the E&M Class of a first-year Physics with Calculus series. We're working with determining the electric fields of extended objects with integration, and I'm having trouble with properly modeling the problems. If someone could show me a sample solution to one of these, I feel it could really help. Here goes: Consi

Voltage Due to Charge Configuration

See the attached file. Let a uniform surface charge density of 5 nc/m2 be present at the z=0 plane, a uniform line charge density of 8 nc/m, be located at x=0, z=4 and a point charge of 2 μC be present at P(2,0,0). If V=0 at M(0,0,5), find V at N(1,2,3). It seems to me that I need to find the electric field intensity for eac

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

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

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

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?

Charge plate in an ionic solution

The situation is as follows: Put a charged plate in a solution - the sign of the charge doesn't matter - in response, counterions will form in the solution such that - at infinite - the total electric field cancels. However, nearer the plate, you have a distribution of these counterions that is determined by the potential - V

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