At standard pressure (760 mm) water boils at 100c. a vacuum pump is used to reduce the ambient pressure above water under a sealed bell jar. by reducing the pressure, the boiling point is lowered so that the water begins to boil at room temperature. what is the approximate pressure at which water boils at room temperature (22c)?

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?