Help with multiple choice Q (1 Viewer)

[fl0]

I feel like a fat dumbass cos I can't do the first question of a SPECIMEN HSC Q. To slightly ease my misery, could someone please explain to me why the answer is A?

 

[deterministic]

Conventional current is going down (+ to -).
Magnetic field is going left at the current position of the wire (as it goes from N to S, so field is always going away from N).
Use FBI left hand rule to deduce the wire is going clockwise.

 

[jamesfirst]

I don't get the diagram...

:S

 

[fl0]

It's these type of questions that just freak me out, making me think I'll get a Band 2 ..

 

[hscishard]

Just use the right hand rule
Current flowing down. magnetic field lines are north to south

 

[Aquawhite]

Just use the right hand rule
Current flowing down. magnetic field lines are north to south

+1.

 

[jamesfirst]

Just use the right hand rule
Current flowing down. magnetic field lines are north to south

How can you determine the force if the direction of the current is parallel to the magnetic field :S:S:S:S

im confused

 

[xV1P3R]

It doesn't if it's parallel, but there are a few field lines higher up which are perpendicular to the current.

 

[jamesfirst]

So are we viewing the apparatus from a top view ??

If we use the right hand push rule wouldn't the suspended go into the page ?

 

[xV1P3R]

It's a side on view