June 6, 2011

All we did for today’s class is answered the Review Problemzz on the Board!

Review Problem Answer Key!

1. Opposite attract likes repel

2. 2. Magnet polarizes the object & attracts the electrons of the object

3. - Temporary magnet

- Nail paperclip

- Tiny loops of current within the substance

4. Domain are no longer aligned

5. It unaligns the magnetic domain weakening the strength of the magnet
. . . . . .

6. S-----------------------N
x x x x x x

7. -Aluminum
-Cobalt
-Nickel

8. You cannot isolate them; because the magnetic domains only flow in are directions. This means the domains would remain uncharged even after breaking it in half.

9. To determine the polarity by using the second right hand rule, curl your finger around the loops in the direction of the conventional current, thumb points toward the North Pole of the magnet.

10. Thumbs à Flow of current

Finger à Magnetic field

Palm à direction of force on wire

11. South Pole, because the north of a magnet is attracted to the magnetic South

12. Magnetic declination is the given location between the magnetic North & Geographic South. Also called the angle of declination.

13. An electric Field surrounds a stationary electric charge.
A magnetic field surrounds a moving electric charges as well as an electric field.

14. B = Fb/IL
0.20/0.10*5 = 0.40T

15. F=BI

= (115min)(5.0x10^-5)

= (4.00x10^-2)

= 2.3N

16. FB = ILB

0.040 = (2.0)(0.1) B

B= -20T

17. Magnetic Field = Fb/IL

Fb=BIL = 0.900T x 8.00A x 0.500m = 3.60N

For does PPL who did not show up to Mrs. K class and don’t understand how we got this answers, talk to Mrs. K before the third Period end. Have a nice half day 2morrow. Better to review Magnetism and Electromagnetism 2morrow because Wednesday we have a test for this unit.