Finding magnetic force direction using Fleming's left hand rule

4 replies · 2K views · last reply
Devs

Homework Statement


Diagram of a circular wire cross-section with a cross inside it marked as current into the page, with horizontal arrows representing a magnetic field pointing to the right. Labels read I = 3.5 A into page, wire cross-section, and magnetic field.

Homework Equations

The Attempt at a Solution


Hi! I got the magnitude using F=qvB using information from the top of the qs. But the direction is confusing me. I used the Fleming's left hand rule but it sort of isn't giving me the right answer
 
Attachments
  • Diagram of a circular wire cross-section with a cross inside it marked as current into the page, with horizontal arrows representing a magnetic field pointing to the right. Labels read I = 3.5 A into page, wire cross-section, and magnetic field.
    upload_2017-10-29_17-45-4.png
    16.7 KB · Views: 967
Devs said:
isnt giving me the right answer
What IS your answer and why do you claim it is wrong ?
 
BvU said:
What IS your answer and why do you claim it is wrong ?

I got an outward direction while the answer says downwards/towards south.
 
Devs said:
I got an outward direction
That would make it parallel to the current. The left- and right-hand rules relate three vectors which are mutually at right angles.
 
For this I learned the corkscrew rule: which way does the corkscrew go when you turn it from ##\vec v## to ##\vec B## ?