题目

Weighing the Options     Making decisions when shopping is often a tough call. Even if you’re satisfied with the first dress you try on, would you go on looking for alternatives, comparing styles and prices, until literally dropped dead?     Psychology researchers have studied how people make decisions and concluded there are two basic styles. “Maximizers” like to take their time and weigh a wide range of options—sometimes every possible one—before choosing. “Satisficers” would rather be fast than thorough.     16. __________ So even if they see what would seem t如图所示，在两平行板间有强度为E的匀强电场，方向竖直向下，一带电量为q的负粒子(重力不计)，垂直于电场方向以速度v飞入两板间，为了使粒子沿直线飞出，应在垂直于纸面内加一个怎样方向的磁场，其磁感应强度为多大？