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

Question

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

Quizplus · Accepted Answer

The Answer of 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

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