A beam of protons is directed in a straight line along the +z direction through a region of space in which there are crossed electric and magnetic fields. The electric field is 450 V/m in the -y direction and the protons move at a constant speed of 10 m/s. 1) What must be the magnitude of the magnetic field such that the beam of protons continues along its straight-line trajectory? (Express your answer using two significant figures.) mT( Submit

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