What is the size and direction of the force on each segment in this gif?

AI Thread Summary
The discussion revolves around calculating the force on segments of a circuit in a magnetic field, specifically addressing segment CD where the angle between the electric current and magnetic field is 45 degrees. The user initially believes the force should be calculated using the formula 40*sin 45, questioning why only 40 is mentioned. A response clarifies that the diagonal length is not 40, implying the formula used is incorrect. The conversation highlights the importance of accurately identifying segment dimensions in physics calculations.
krot
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i need to figure out the size and direction of the force on each segment

http://i32.tinypic.com/1075g8g.gif

in cd segment there is a 45 degree between the electricity and magnetic field
so i need to have size 40*sin 45

why they write only 40
??
 
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am i correct?
 
Welcome to PF!

Hi krot! Welcome to PF! :wink:

Your picture shows a cube with an electric circuit along adjacent j and k edges, and returning along ij and ik face-diagonals, with a uniform magnetic field in the j direction.
krot said:
in cd segment there is a 45 degree between the electricity and magnetic field
so i need to have size 40*sin 45

why they write only 40
??

you would only need 40sin45º if the diagonal was 40 …

it isn't! :smile:
 
krot's been caught. He's a previously banned member.
 
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