a list of physics questions related to electricity (part 1)?

Question

1. Draw magnetic field lines around a straight section of wire carrying a current horizontally to the left.

2. In what direction are the magnetic field lines surrounding a straight wire carrying a current that is moving directly toward you?

3. a horseshoe magnet is held vertically with the north pole on the left and south pole on the right. a wire passes between the poles, equidistant from them, and carries a current directly away from you. in what direction is the force on the wire?

4. after you rub comb and silk, which one is positive? why?

5.when an electroscope is charged, two leaves repel each other and remain at an angle. what balances the electric force of the repulsion so that the leaves dont separate further?

6. when an electric cell is connected to a circuit, electrons flow away from the negative terminal in the circuit. but within the cell, electrons flow to the negative terminal. Explain

7. can copper wire and aluminum wire of the same length have same R?

Answer 1

1. I can't explain better than to tell you to just wrap your fingers around a conductor......your thumb naturally points in the direction that current would flow, and your fingers are naturally pointing in the direction that the flux flows. That's been easy for me to remember.
2. See answer to 1.
3. See answer to 1.
4. I'm guessing silk, because the comb will attract the silk, therefore the comb is more negatively charged.
5. The mass of the upper leaf.
6. Got me on that one. I know, but don't know how to explain it. It has something to do with the charge of the electrons being depleted as current flows to the load, but I'm no chemist.
7. Yes, but you would have to drastically cool the aluminum to get the same conductivity as copper.

Answer 2

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Answer 3

"1. Draw magnetic field lines around a straight section of wire carrying a current horizontally to the left."

Are there any particular words you don't understand in this sentence? It seems quite straight-forward.

What do you already know about current?

What do you already know about magnetic fields and magnetic field lines?


Perhaps if you could ask a more specific question about precisely what concepts you don't understand, then someone might know what it is you need explained.

Answer 4

When you're done with that, maybe you can help me with my homework.