Three long wires parallel to the x axis carry currents as shown. If /= 17 A, what is the magnitude of the magnetic field at the origin? 41 y = 2 m y =-1m 31 y =-3 m

1. A proton has velocity v = (40,000 i +30,000 j) m/s as it enters a uniform magnetic field B-70 µT 1. What are (a) the radius of the helical path taken by the proton and (b) the pitch of that path? (c) To an observer looking into the magnetic field region from the entrance point of the proton, does the proton spiral clockwise or counterclockwise as it moves?

At what distance (in mm) from a long, straight wire carrying a current of 20 A will the magnitude of the magnetic field be 1.9 mT?

A thin 1.65 m long copper rod in a uniform horizontal magnetic field has a mass of 58.0 g. When the rod carries a current of 0.286 A directed perpendicular to the magnetic field, it floats in the magnetic field.   What is the field strength of the magnetic field? Answer in units of T.

The magnitude of the magnetic field a distance of l away from a long, straight current carryingwire is B. How far from the wire is the magnitude of the magnetic equal to 1/2B?

Two long parallel wires 20 cm apart carry currents of 5.0 A and 8.0 A in opposite directions. What is the magnitude of the net magnetic field midway between the wires? O 1.3 x 10-5 T 1.0 x 10-5 T 2.6 x 10-5 T 6.0 x 10-6 T 1.6 x 10-5 T

Two long wires are oriented so that they are perpendicular to each other. At their closest, they are 20.0 cmcm apart (Figure 1).   What is the magnitude of the magnetic field at a point midway between them if the top one carries a current of 22.0 AA and the bottom one carries 13.5 AA ? Express your answer using three significant figures.   B=?