1. Physics 12
Mr. Jean
December 10th, 2012

2. The plan:
Video clip of the day
Right hand Rules (Review)
Magnetism

3. Santa & Fun:
He’d have to experience an acceleration somewhere in the ballpark of 30 billion g’s, on and off, for 12 hours, but again, that’s doable.

4. G-Forces
Even using so-called “conventional science” a human being can survive as much as 15 g’s when suspended in a fluid.
The highest acceleration survived by a human (a human named Col. John Stapp) is 46 g’s, and he was blind for barely a day.
But, keep in mind that rather than being a grouchy young human, Santa is in fact a jolly old elf.

6. More problems with speed:
Traveling with an average speed of 17 million kph means that the back of Santa’s sleigh is in a hard vacuum.
More than that, the heat energy generated by Santa’s trip totals about 2 x 1015 tons of TNT equivalent, or about 40,000 metric tons of anti-matter (and 40,000 matching tons of ordinary matter).

7. Booooo to logic & reasoning:
“Conventional” physics would say that the surface of the Earth would be completely vaporized by this joyous and welcome yearly Yule Tide.
What they don’t take into account is jingle-Bell’s theorem of quantum Christmas, and a generous helping of X-mas miracles!

8. Thank you Santa!
It would take about 5,000,000 Santa’s (or about 1022 tons of TNT) to completely destroy (disassemble) the Earth.
2 x 1015 tons of TNT would just throw the top half mile or so into space.
Happy holidays & Merry Christmas!!!

10. The Right-Hand Rule #1:

12. Right-Hand Rule #3:

15. You cannot "break" magnets into separate "monopoles".
Poles always come in pairs.

16. Right Hand Rule #2:
Place the fingers of your right hand long the wire coil so that your fingers point in the direction of the current in the coil.
When you extend your thumb at a right angle this will indicated the “North Pole” of the coil.
This is really just the first rule, but extended.

18. Second Right Hand Rule:
SECOND right hand rule (p. 764):
Grasp the coil with your right hand with fingers pointing in direction of current. Your thumb points towards the N pole of the magnet.

19. Magnetic Field of a current carrying coil of wires (conductors):
You can apply the right hand rule to this type of a situation as well.
The magnetic field produced by an electric current in a coil of wire can be visualized as the superposition of the magnetic fields of the current loops which make it up.
The fields of the individual current loops add inside the coil to produce a strong and fairly uniform magnetic field.

20. Demo:

21. Iron Filings for Bar Magnet:

22. Iron filing art work?

23. Magnetic Field in a Solenoid:
A long straight coil of wire can be used to generate a nearly uniform magnetic field similar to that of a bar magnet.
Such coils, called solenoids, have an enormous number of practical applications.

24. In the above expression for the magnetic field B, n is the number of turns per unit length, sometimes called the "turns density". The expression is an idealization to an infinite length solenoid, but provides a good approximation to the field of a long solenoid.

26. Review for tomorrow’s Test: