Electricity and Magnetism Answers

A magnetic field is produced inside a cubic chamber of volume A and the electromagnetic waves propagate at the speed of light c. If some other particle is present in this chamber, list the four conditions under which this particle of mass m will experience a force-free "life".

Suppose we make our Physics laboratory a 10 micro-Henry inductor by wrapping a 0.030cm diameter wire around a 4.0 mm diameter cyclical core. How long must this core be?

A tightly wound coil of 10cm carrying a current of 1A.What is magnetic field at centre of coil

two tuning forks A and B produce 10 beats per second. on loading a small ring on one prong of B again 10 beats per second are produced.what was the frequency of B before loading small ring if now frequency of B is 430Hz? give reason for your answer

a) Jessica examined the reflections visible from the water surface of the aquarium. At what angle does the light from the lamp have to hit the surface of the water for the light to be completely polarized?

b) Jessica continued her research by dropping a glass cube on the bottom of the aquarium. At what angle does the light have to hit the surface of the glass cube in order for the goldfish swimming in the aquarium to see the light reflected from it perfectly polarized?

The wavelength of the school demonstration laser is measured using a grating with 300 slits per millimeter. To this end, a magnet-mounted meter-long ruler is attached to the whiteboard and the laser light is directed perpendicular to the whiteboard. When the grating is placed between the laser and the board 0.79 meters from the board, a light pattern as shown in the figure is detected on the board. Determine the laser wavelength using 2nd order diffraction maxima.