Un tapón de latón se colocará en un anillo hecho de hierro. a 15°c, el diámetro del tapón es de 8.753 cm y el del interior del anillo es de 8.743 cm. ¿a qué temperatura común se deben llevar ambos con la finalidad de que ajusten? b) ¿y si el tapón fuera de hierro y el anillo de latón?

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?