A Bar (L = 80 Cm) Moves on Two Frictionless

question 47

Multiple Choice

A bar (L = 80 cm) moves on two frictionless rails, as shown, in a region where the magnetic field is uniform (B = 0.30 T) and into the paper. If v = 50 cm/s and R = 60 mΩ, what is the magnetic force on the moving bar?

• A)0.48 N to the right
• B)0.48 N to the left
• C)0.32 N to the left
• D)0.32 N to the right
• E)None of the above

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