Electricity and Magnetism Answers

A Practical Matter A power line carries a current of 350 A. What is the magnetic field in a house located 95 m away from the power line?

a small cyclotron had a larger radius of 2m, used for accelerating protons with intensity magnetic field 3T. Calculate the 1) frequency of the accelerating potential 2) the kinetic energy of protons when exist from cyclotron

A practical matter power line carries a current of 500 A. What is the magnetic field in a house located 100m away from the power line

A current is 1.5 ampere in a 800 turns coil produce 1.5 x 18–⁵ Weber magnetised flux in each turn. Find out the self induction of coil

Two conductors are made of the same material and have the same length. Conductor A is a

solid wire of diameter 1.0 mm. Conductor B is a hollow tube of outside diameter 2.0 mm

and inside diameter 1.0 mm. What is the resistance ratio RA/RB, measured between their

ends?

What happens if you cut a bar magnet in half between the north and south poles? Explain your answer.

Why are the poles of a magnet called north and south poles? Explain your answer.

1. What are some examples of nonmagnetic materials? Why are these materials nonmagnetic? Explain your answer. 

An inductor is connected to an AC voltage source with peak voltage 35 V at 200 Hz, and the rms current is measured to be 52 mA. Calculate the inductance.

Give the value in henrys, to 2 decimal places.

I have a problem where two charged spheres repell each other, and as they do so compress springs. Solving for the k of the springs using force analysis is simple and results in a k value of about 55 N/m. If however you try to solve using conservation of energy you get a very different result at around 439 N/m. I can't see where either solution is incorrect but also can't resolve the difference:

Two spheres 8cm apart are each charged with 2.5 x 10^-6C. They come to rest 16cm apart. Find k.