ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Physics => Topic started by: golden on July 06, 2011, 09:26:12 pm

Title: Heinemann Question!
Post by: golden on July 06, 2011, 09:26:12 pm

Forces on moving charges - is this on the course?

Title: Re: Exercise 9.5 From Heinemann
Post by: Lasercookie on July 06, 2011, 09:41:39 pm

It states in that chapter the magnetic force on an electric current is due to the force on moving charges.
Magnetic forces and current are in the study design, so that would lead me to assume that forces on moving charges would come under that dot point.

I guess you have to keep in mind that the study designs are kind of very ambiguous, so I can't really say for sure.

Also, the formula given in that exercise is directly mentioned in the synchrotron section of the study design.
 

Title: Re: Exercise 9.5 From Heinemann
Post by: golden on July 07, 2011, 10:10:10 am

Well we skipped that exercise in class, but I'll probably still look over it. Thanks for the information.

Title: Re: Heinemann Question!
Post by: golden on July 09, 2011, 02:02:18 pm

Is the example on the top of the page 342 incorrect?
Shouldn't the N and S be the opposite way around as in the diagram?

Title: Re: Heinemann Question!
Post by: Lasercookie on July 13, 2011, 06:32:05 pm

Quote from: golden on July 09, 2011, 02:02:18 pm

Is the example on the top of the page 342 incorrect?
Shouldn't the N and S be the opposite way around as in the diagram?

I'm pretty sure it's correct. Using the right hand grip rule, the direction your fingers curl are the direction of the solenoid's current. Position your fingers to curl in the same direction as the current and your thumb  ends up pointing to the left. It's kind of confusing explaining it with words.

Like this:
[img]http://sciencecity.oupchina.com.hk/npaw/student/glossary/img/right_hand_grip_rule_2.jpg[/img]

Actually, I'm pretty sure that picture is depicting the same solenoid as the one on page 342.

Edit: If you're confused about the different right hand rules, this webpage is good: http://waowen.screaming.net/Maghandrules.htm. Take note of the fact that solenoids have a different right hand grip rule to the one used for straight wires (difference being what the thumb represents)

Title: Re: Heinemann Question!
Post by: golden on July 23, 2011, 06:20:48 pm

Page 369 from the textbook, worked example 10.3 A.

If the change in magnetic flux is to the left that means that the 'induced flux' should be to the right.
Using the right hand grip rule doesn't that show that the current goes from X to Y rather from Y to X?