Paths Through a Uniform Magnetic Field; Solenoids; Net Magnetic Field

1) The figure (*see attachment) shows 11 paths through a region of uniform magnetic field. One path is a straight line; the rest are half circles. The table (*see attachment) gives the masses, charges and speeds of the 11 particles that take these paths through the field in the direction shown. Which path corresponds to which particle in the table? 2) The following table (*see attachment) gives the number of turns per unit length, n, and the current, I, through six ideal solenoids of different radii. You want to combine them concentrically to produce a net magnetic field of zero along the central axis. Can this be done with (a) two of them, (b) three of them, (c) four of them, (d) five o... click for more

Electricity Problems (Magnetic Flux; Magnetic Field; Current; Voltage; Energy; Resistance; Reactance; Frequency)

I need help with the attached electricity problems. Example: 1) A piece of copper wire is formed into a single circular loop of radius 17 cm. A magnetic field is oriented parallel to the normal to the loop, and it increases from 0 to 0.64 T in a time of 0.65 s. The wire has a resistance per unit length of 4.9 x 10-2 OHM/m. What is the average electrical energy dissipated in the resistance of the wire? 2) A generator uses a coil that has 440 turns and a 0.48-T magnetic field. The frequency of this generator is 60.0 Hz, and its emf has an rms value of 120 V. Assuming that each turn of the coil is a square (an approximation), determine the length of the wire from which the coil is made.... click for more

Lab Questions

1) Does the law of Reflection apply to microwaves when they strike a metallic plate?Explain. 2)Does the Law of Refraction apply to microwaves when they strike a prism? ex. does this prodice constant values... Explain.

questions on circuits and ohms law

i have 6 questions that i am strugling with, i need the answers to these to continue further. please see attached

Wavelength

A cord is 20cm long, four complete waves fit along its length when vibrated 30 times per second for the waves on the cord. What is the wavelength? What is the frequency? What is the speed?