Blood contains both positive and negative ions. In a certain patient being tested, the speed of these ions in a large artery is measured at 0.60 m/s. The patient is placed in a uniform magnetic field of 0.20 T. If a potential difference of 1.0 mV is measured across the diameter of the artery, what is that diameter?

Blood contains both positive and negative ions. In a certain patient being tested, the speed of these ions in a large artery is measured at 0.60 m/s. The patient is placed in a uniform magnetic field of 0.20 T. If a potential difference of 1.0 mV is measured across the diameter of the artery, what is that diameter?