A positive particle and a particle of unknown charge are separated by 5 cm as shown below. Suppose the positive particle has a charge of 100 //C and is going at the speed of sound. You do not know the "unknown" particle's charge (magnitude or sign), but its speed is half of the positive particle's speed. When you measure the magnetic field directly between them you get a magnitude of 1.05 /T. Determine the unknown particle's charge (magnitude and sign)