Electric and Magnetic Waves

A magnetic field has a magnitude of 1.2 10-3 T, and an electric field has a magnitude of 4.7 103 N/C. Both fields point in the same direction. A positive 1.8 µC charge moves at a speed of 3.0 106 m/s in a direction that is perpendicular to both fields. Determine the magnitude of the net force that acts on the charge. Answer in Newtons I thought it was qE + the Force from the Electrical Field, but that wasn't it.

Charge to Mass Ratio

A charged particle moves through a velocity selector at a constant speed in a straight line. The electric field of the velocity selector is 3.25 103 N/C, while the magnetic field is 0.360 T. When the electric field is turned off, the charged particle travels on a circular path whose radius is 4.20 cm. Find the charge-to-mass ratio of the particle. Answer Units are C/kg I am completely lost on this problem.

Electrostatics: Electric Force and Electric Field

Use Gauss's Theorem whenever possible: 1. Two point charges, one positive and the other, a negative charge, are separated by a small distance. (a) Determine the ratio q1/q2 ? (b) What are the signs of q1 and q2? (See attachment for all questions)

Wave Optics: Interference and Diffraction

1.A circular diffraction pattern is formed on a faraway screen. (a) By what factor will the width of the central maximum change if the wavelength is doubled? (a) 4 (b) 2 (c) 1 (no change) (d) 1/2 (e) 1/4 (b) By what factor will the area of the central maximum change if the slit width is doubled? (a) 4 (b) 2 (c) 1 (no change) (d) 1/2 (e) 1/4 2. Consider a Young's two-slit experiment in which the wavelength of light is 38% smaller than the distance between the slits. (a) How many complete dark fringes would be seen on a distant screen? (Assume for all these questions that the screen is a... click for more

Optics: Resolving Power

1. The telescope on Mount Palomar has a diameter of 200 inches. Suppose a double star were 8.40 light-years away. Under ideal conditions, what must be the minimum separation of the two stars for their images to be resolved using light of wavelength 550 nm? (Unit: m) All answers must have three significant digits unless otherwise specified. 2. The Impressionist painter Georges Seurat used a technique called pointillism , in which his paintings are composed of small, closely spaced dots of pure color, each about 2 mm in diameter. The illusion of the colors blending together smoothly is produced in the eye of the viewer by diffraction effects. Calculate the minimum viewing distance fo... click for more