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just tell the right options for this one 21 TUTU places a wire between two posts in a phys 1310 lab. If TUTU notes a

just tell the right options for this one

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21 TUTU places a wire between two posts in a phys 1310 lab. If TUTU notes a magnetic field of magnitude B using a hall effect sensor at a distance d, what is the magnetic field at a distance d/2? O A. B/2 O B. 8B O C. B/4 O D. 2B O E. 4B 22 Which of the following devices or procedures does not apply a potential difference? O A. electroencephalography O B. electrocardiography O C. defibrillator O D. Neurons O E. All of these make use of potential difference

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