Answer Happy

Two charged particles enter a region with a uniform magnetic field pointing into the page, and follow the paths shown. Which of the following must be true about the signs of the charges and their magnitudes? [a] q₁ is positive, q2 is negative, |q₁|> 1921 q₁ is negative, q2 is positive, |q₁| > 1921 [c] q₁ is positive, q2 is negative, |q₁| < |9₂| [d] q₁ is negative, q2 is positive, q₁ < 1921 Four long, straight parallel wires carry currents of equal magnitude along the z-axis. They are arranged as comers of a square as shown. What is the direction of the resulting magnetic field at the center of the square? [a] +x -x [c] +y [d] -y [e]+z [g] no direction (field is zero) [f] - z 91 92 1 1 1