A Hall-effect probe operates with a 120 mA current. When theprobe is placed in a uniform magnetic field of magnitude0.0860 T, it produces a Hall voltageof 0.760 µV.
(a)When it is measuring an unknown magnetic field, the Hallvoltage is 0.400 µV. What is themagnitude of the unknown field?
The equation that I would use to get this is ΔV[Hall]=(Hall Field Eh) d which also equals vBd. But I'm not givend and can't find v since they dont give any dimensions on theconductor. Another equation i could've used was ΔV[Hall]=(IB)/(nqt). I assumed what n and q were by anotherexample in the book, but once again i have no dimensions for t, soI'm lost as to what to do.