some questions from HSC 03 help! (1 Viewer)

[helper]

I'd say you vary magnetic field strength by
using 1 or 2 identical magnets with different distances

Use 1 magnet if you dont care about the type of field
2 magnets if you want straight field-lines
[forgot the tech. word for that, i think it
might be a uniform field?]

the other variables are made controls by not
changing them inbetween testing

As the syllabus dot point specifically mentions changing distance as another variable, they expect distance to be kept constant, so do what Sunjet said, use identical magnets of different strengths.

 

[serge]

As the syllabus dot point specifically mentions changing distance as another variable, they expect distance to be kept constant, so do what Sunjet said, use identical magnets of different strengths.

Is a uniform magnetic field what i think it is

field lines going from one north pole to another magnets south pole?

 

[helper]

For the satellite they were just after what was written originally but be in how you use the term velocity boost.

 

[helper]

Is a uniform magnetic field what i think it is

field lines going from one north pole to another magnets south pole?

No, it means a field of constant strength. So the magnetic field lines would be parallel and of even spacing.

 

[Haku]

i think by uniform it meant radial magnets so the field lines cut the conductor the same no matter where it is or what degree it is...

 

[serge]

No, it means a field of constant strength. So the magnetic field lines would be parallel and of even spacing.

Right

but you cant have a uniform field with one magnet?

i think by uniform it meant radial magnets so the field lines cut the conductor the same no matter where it is or what degree it is...

thats true as well

 

[Haku]

well of course u gotta have two

radial magnet produce a more uniform B field right?

 

[serge]

well of course u gotta have two

radial magnet produce a more uniform B field right?

yes, it does

its just sunjet didn't explain whether 1,2,3 or 4 magnets were
all on one side? which would change the field strength
but the field would not be uniform

 

[sunjet]

you people are looking into into it too much.. relax.

 

[serge]

No, it means a field of constant strength. So the magnetic field lines would be parallel and of even spacing.

radial magnets dont need parallel lines

or does the surface being curved change something?

 

[serge]

you people are looking into into it too much.. relax.

good point

chemistry's first

 

[helper]

I apologise but can someone point me to the context, uniform magnetic field is being used at the moment?

A radial magnetic field may be of uniform strength but is not a uniform field as the direction is changing.

 

[sunjet]

here's a quick rundown of my aswner:

- labelled diagram of faraday's experiment

firstly, set up the apparatus as shown above. use a regular bar magnet and drop it through the coil with a constant velocity. measure the current on the galvanometer. next, add an extra bar magnet (by elastic, make sure the poles are pointing the same direction), the same size, onto the original to double the magnetic field strength. then drop it through the coil with same velocity. by comparing your results it will be evident that a larger current will be induced when there is a greater magnetic field strength.

edit: (helper's question). drop it from a set height allows the velocity to be kept the same.

and for the slingshot question:

if launched from west to east close to the equator, the satellite can pick up the additional velocity required to reach its target due to earth's rotation on its axis.

 

[helper]

Add to that how you made the velocity constant, as that was the markers comments, that people said what they kept constant but not how.

 

[Haku]

but wouldn't there be a constant acceleration? but maybe u could say in both test the variables are kept constant without mentioning velocity.