4. A 1.0 kg copper rod rests on two horizontal rails 1.0 m apart and carries a current of 50 A from one rail to the other. The coefficient of static friction between rod and rails is µs = 0.60. What are the (a) magnitude and (b) angle (relative to the vertical ) of the smallest magnetic field that puts the rod on the of sliding? (Chapter 28, Problem 47, Fundamentals of Physics - 10th ed.) verge

4. A 1.0 kg copper rod rests on two horizontal rails 1.0 m apart and carries a current of 50 A from one rail to the other. The coefficient of static friction between rod and rails is µs = 0.60. What are the (a) magnitude and (b) angle (relative to the vertical ) of the smallest magnetic field that puts the rod on the of sliding? (Chapter 28, Problem 47, Fundamentals of Physics - 10th ed.) verge