Arigid wire is put into the shape of a square with side length l. the square has a mass m and carries a current i. the square lies on a horizontal surface(x-y plane) and there is a uniform magnetic field b that is in the +x direction. what is the minimum value of the magnetic field so that one edge of the square will lift off the surface

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.