Anonconducting sphere has mass 87.2 g and radius 19.8 cm. a flat, compact coil of wire with eight turns is wrapped tightly around it, with each turn concentric with the sphere. the sphere is placed on an inclined plane that slopes downward to the left (see figure below), making an angle ? with the horizontal so that the coil is parallel to the inclined plane. a uniform magnetic field of 0.360 t vertically upward exists in the region of the sphere.
(a) what current in the coil will enable the sphere to rest in equilibrium on the inclined plane?
(b) show that the result does not depend on the value of ?