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# Electricity & Magnetism

### Average electric field strength and average magnetic field strength

A laser emits 1.30 1018 photons per second in a beam of light that has a diameter of 1.82 mm and a wavelength of 514.5 nm. Determine average electric field strength and average magnetic field strength. Answer in N/C and T.

### Thomson's Apparatus

A diagram for the Thomson's apparatus is given in the attachment. (a) Show that the total deflection of the beam is given by y1 + y2 = e/m*[(B^2)/E][(x1^2)/2 + x1*x2] where B is the magnetic field and E the electric field. (b) Show that the angle the electron is deflected is given by theta = e/m * [Ex1/(u^2)].

### Electric and Magnetic Fields

A magnetic field has a magnitude of 12 T. What is the magnitude of an electric field that stores the same energy per unit volume as this magnetic field?

### Magnetic Field

A 1140nF capacitor with circular parallel plates 1.12cm in diameter is accumulating charge at the rate of 20.7mC/s at some instant in time. What will be the induced magnetic field strength 10.8cm radially outward from the center of the plates? What will be the value of the field strength after the capacitor is fully charged?

### Earth's magnetic field

Differentiate between the Earth's magnetic field and its production versus that of an ordinary bar magnet.

### Proton source: Speed of the protons, radius of the final path

See attached file for the diagram. A proton source provides protons of various speeds. Protons of a particular speed follow the dotted line through the speed selector. The speed selector has an electric field of 3100 V/m and a magnetic field of 0.35T. The protons that the speed selector selects follow the dotted path.

### Current and Force: Find the magnitude of the currents in A

Two long, parallel wires are separated by a distance of 0.20 m and carry equal currents. There is a force of attraction per meter of 6.5 X 10-5 N/m between them. Find the magnitude of the currents in A and deterimne if they are parallel or anti parallel.

### Determine the charge of ions based on the movement in a solution

A copper sulfate solution is placed in a container that contains coaxial cylindrical copper electrodes, as indicated in the picture. An electric field is created by connecting a battery across the electrodes as shown. A magnet field is created by immersing a magnet in the center of the solution as shown. Uncharged pollen g