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Q. A thin copper rod 1.00 m long has a mass of 50.0 g. What is the minimum current in the rod that would allow it to levitate above the ground in a magnetic field of magnitude 0.100 T?

Q. A charged practical enters the magnetic field of a mass spectrometer at a speed of 1.79*10^8 m/s . It subsequently moves in a circular orbit with radius 16.0 cm in a uniform magnetic field of magnitude 0.350 T having a direction perpendicular to the particle's velocity . Find the particle's mass-to-charge ratio?

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