A conducting bar slides without friction on two parallel horizontal rails that are 50 cm apart and
connected by a wire at one end. The resistance of the bar and the rails is constant and equal to 0.10
􀌛. A uniform magnetic field is perpendicular to the plane of the rails. A 0.080-N force parallel to
the rails is required to keep the bar moving at a constant speed of 0.50 m/s. What is the magnitude
of the magnetic field?

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  3. 👁 975
  1. 200.0 mL of 0.750 M calcium nitrate is added to 100.0 mL of 0.500 M ammonium sulfate. What is the mass
    in grams of precipitate formed?

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