Electricity and Magnetism Answers

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.

While taking a bath, a person touches the metal case of a radio. The path through the person to the drainpipe and ground has a resistance of  4000  Ω  .  What is the smallest voltage on the case of the radio that could cause ventricular fibrillation? Estimate  what was the power dissipated in the body during the  impact?

9. In Fig.2

v1= √2(16)sin Wt V,

V2 =√2(24) sin(Wt +90°) V, and

v3=√2(15) sin(Wt -90°) V.

Determine the source voltage, e

determine the work done by a force F = xyi + yzj + xzk in taking a particle along the path defined by the equation r(t)=ti + 2t²j + t³k, 0≤t≤1 from t=0 to t=2.

1. Say whether each of the following will make the electromagnet stronger, weaker or have no effect: 
2. Increasing the number of turns of wire. Stronger
3. Decreasing the current passing through the wire.
4. Putting the nail into the coil from the  opposite direction

(a) Determine the equation for the waveform of Figure 1, given f = 60 Hz. (b) Compute current at t = 4 m