Answer to Question #50890 in Mechanics | Relativity for Tejasvi Hegde

Question

Let a copper rod of mass m rest on two horizontal rails that are L meters apart and carry a current of I amperes from one rail to another. Let the coefficient of static friction between the rod and the rails be u.
What is the (1)magnitude and (2) angle (with respect to the vertical) of the smallest magnetic field that puts the rod on verge of sliding ?