A thin conducting wire is bent into the shape shown in the figure. The circular portion of the wire has radius R. The wire is in the plane of the screen and carries a current I. (a) What is the direction of the magnetic field at the center of the loop? O to the left O to the right O upward downward O into the screen O out of the screen (b) Find an expression for the magnitude of the magnetic field at the center of the loop. (Use the following as necessary: R, I, and Ho: Do not substitute numerical values; use variables only.)

A current path of the shape shown in the figure produces a magnetic field at P, the center of the arc. If the arc subtends an angle of 30 ° and the radius of the arc is 0.600 m, what are the magnitude and direction of the field produced at P if the currents are 3A?

10) A proton is moving in a constant magnetic field, see figure, what is the direction of the force on the proton? Velocity proton B-Field