Physics Electromagnetism Flashcards
1
Q
how to find the magnetic field around a bar magnet using iron filings?
A
- place a piece of people in top of a bar magnet
- sprinkle iron filings on top of paper
- tap the paper to show the magnetic field lines
2
Q
How to find the magnetic field around a bar magnet using a compass?
A
- on a piece of paper, draw around the bar magnet
- place a plotting compass near the magnet and mark north and south. draw a line between north and south marks
- repeat to show the magnets field
3
Q
3 rules for drawing magnetic field lines
A
- draw at least 3 lines
- field lines CANNOT cross
- field lines go from N —> S
4
Q
3 magnetic metals?
A
iron, cobalt, nickel
5
Q
what is a permanent magnet?
A
a magnet where all the domains align
6
Q
What is the magnetic field between opposite poles?
A
Straight, parallel, uniform field lines
7
Q
if a current goes into you, which direction do the field lines go around
A
anticlockwise
8
Q
if a current goes away from you, which direction do the field lines go around
A
clockwise
9
Q
what is current going into you equivalent for in a wire
A
around a wire carrying current out of the page
10
Q
what is current going away from you equivalent to in a wire?
A
around a wire carrying current into of the page
