# Electromagnetism theory questions

1. Nov 7, 2012

### skg94

1. The problem statement, all variables and given/known data
1. http://http://tinypic.com/r/2r386q1/6 [Broken]

Determine the polarity of the induced magnetic field and direction of electron flow for each. Indicate which end of the generator becomes a negative terminal.

I dont know how to do the last two that you see e and f

2. In the following diagram, a metaliic conductor is moved along a set of conducting rails across a magnetic field. Which end of the conductor becomes the negative terminal? In which direction does convetional current flow in the circut?

http://tinypic.com/r/hwijxj/6

3. A positively charged sphere is suspended between two large metal plates as shown in the diagram. A wire is placed between the poles of a horseshow magnet and connected to the metal plates. When the wire is drawn horizontally to the right the charged ball is observed to swing toward the right hand metal plate.

a) Determine the direction of the induced electron flow in the wire in the horseshoe magnet.
b) Is the top pole of hte magnet a north or south pole explain?
http://tinypic.com/r/ncmkh2/6

2. Relevant equations
none

3. The attempt at a solution

Im completely at a loss at these theoritcally quesitons if anyone can please help me, i have a test tomorrow and i am desperate to learn, i have made some attempts but my logic on these things seem flawed and are just mere guesses.

- wont work so the link is posted

Last edited by a moderator: May 6, 2017
2. Nov 7, 2012