4. (1 pt) A loop of wire carries current with all parameters as in the previous problem. A proton with a velocity 3 x 106 m/s in the +y direction passes through the point [(10,5ch - in other words. 5cm above the center of the circle. What is the magnetic force on the proton at that instant? 5. (1 pt) For the same configuration as the previous two problems, a segment of wire of length 10'5 m lies in the center of the circle and carries a current of 300mA in the -x direction. What is the force on this wire segment? Note that you may approximate the magnetic field as being constant over the length of this short segment of wire. 6. (1 pt) Along power line carries a current of 500A. What is the magnitude of the magnetic field due to this power line 1 m away from it? How does this compare to the typical ambient magnetic field of the Earth