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hello i need help and show works please thank you A Hall-effect probe operates with a 316mA current. When the probe is placed in a

hello i need help and show works please thank you

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A Hall-effect probe operates with a 316mA current. When the probe is placed in a uniform magnetic field of magnitude 67.3mT, it produces a Hall voltage of 0.81uV. When it is used to measure an unknown magnetic field, the Hall voltage is 0.74uV. Find is the magnitude of the unknown field (unit in mT)

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