题干

如图所示,一水平放置的圆形通电线圈1固定,从上往下看,线圈1始终有逆时针方向的恒定电流,另一较小的圆形线圈2从1的正下方以一定的初速度竖直上抛,重力加速度为g,在上抛的过程中两线圈平面始终保持平行且共轴,则在线圈2从线圈1的正下方上抛至线圈1的正上方过程中(   )

A:线圈2在1正下方的加速度大小大于g,在1正上方的加速度大小小于g

B:线圈2在1正下方的加速度大小小于g,在1正上方的加速度大小大于g

C:从上往下看,线圈2在1正下方有顺时针方向,在1正上方有逆时针方向的感应电流

D:从上往下看,线圈2在1正下方有逆时针方向,在1正上方有顺时针方向的感应电流

上一题 下一题 0.0难度 选择题 更新时间:2017-05-06 03:53:46

答案(点此获取答案解析)

D

同类题3

通读下面短文,掌握其大意,然后在各题所给的四个选项中选出一个最佳答案。

    Three soldiers were on their way home from the war. They arrived at a small village, they were very tired and 1 but they had no food or money. The only thing they did have was a cooking pot(锅).

    The soldiers built a small cooking fire, 2 their pot on it, and poured in some water. When a few villagers asked what they were doing, one of the soldiers answered that he was making stone soup. A few more villagers walking by stopped to 3 what was going on when they heard about it.

    "Any soup needs salt and pepper," the first soldier said, 4 some children ran to fetch salt and pepper. "Stones can be used to prepare good soup, but tomatoes would 5 it so much better," the second soldier added. One woman said, "Why, I think I have a tomato or two! "She ran to get the tomatoes.

    "Some cabbage would be a proper choice for a good stone soup! "said the third soldier. Another woman said, "I think I can probably find some cabbage," and she ran 6.

    "If only we had a bit of beef and some potatoes, this soup would be fit for a rich man's 7." The villagers thought it over, then ran to fetch what they had in their homes. A rich man's soup, and all from a few stones! It seemed like 8!

    The soldiers said, "If only we had a little milk, this soup would be fit for a king!" And so other villagers 9 to get some milk.

    "The soup is ready," said the cooks, "and all will 10 it, but first we need to set the tables." Some of the villagers said, "Such a great soup would be better 11 some bread and cakes," so they brought the 12 two things and the meal was 13 by all. Never had there been such a 14 meal. Never had the villagers had such delicious soup, and all made from stones! They ate and drank and danced well into the night.

    In the morning, the villagers gathered to say goodbye. "Many thanks to you," they said, "for we shall 15 go hungry now that we have learned how to make soup from stones."