3. Two straight wires carrying the same current are at two adjacent vertices of a square with the side a. First wire carries current into the plane of the page and other one -out of the page, as shown. The magnitude of the magnetic field at the center of the opposite side, at point P, is B. a) Find the magnitude of each current in terms of B. b) A proton is moving in the magnetic field due to the wires at the velocity vat 27° below the +x-axis. Find the magnitude and direction of the magnetic force on the proton at the instance when the proton is at point P. a YA

3. Two straight wires carrying the same current are at two adjacent vertices of a square with the side a. First wire carries current into the plane of the page and other one -out of the page, as shown. The magnitude of the magnetic field at the center of the opposite side, at point P, is B. a) Find the magnitude of each current in terms of B. b) A proton is moving in the magnetic field due to the wires at the velocity vat 27° below the +x-axis. Find the magnitude and direction of the magnetic force on the proton at the instance when the proton is at point P. a YA