A Bar (L = 80 Cm)moves on Two Frictionless Rails,as

question 60

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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