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## Homework Statement

A current loop that lines in the horizontal plane consists of a straight line segment 2R and semicircular segment with a radius R. A current I flows through the loop (assume counterclockwise direction), and a uniform magnetic field B points outward of the page everywhere. Provide magnitude and direction for all forces.

*Sorry the picture is so big an blurry*

a) What is the force on straight segment due to magnetic field?

b) What is the force on two elements of current dI1 and dI2 symmetrically arranged on the semicircle (sorry I don't know how to draw them, but they are symmertrical to the origin.

## Homework Equations

F=ILBsintheta

F=qvBsintheta

*right hand rule*

## The Attempt at a Solution

a) since no numbers were given:

L = 2R

F=2IRBsintheta

but I dont know B or theta

and using the right hand rule, the direction of the force is down.

b) This one is different, because there are two elements of current and it is curved. Using the right hand rule, the direction is out of the paper. The equation used to calculate force would be F=qvBsintheta. Which causes the same problem I had in part A.