30 pts What are some of the difficulties with measuring the volume of a gas? Select all that apply. A. it could be soluble in liquid
B. it varies depending on the container it is in
C. it varies based on its mass
D. it can be difficult to contain.

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?