题干

如图甲所示,在竖直向上的磁场中,水平放置一个单匝金属环形线圈,线圈所围面积为0.1m2,线圈电阻为1Ω,磁场的磁感应强度大小B随时间t的变化规律如图乙所示,规定从上往下看顺时针方向为线圈中感应电流i的正方向,则(   )

A:0~5 s内i的最大值为0.1 A

B:第4 s末i的方向为负方向

C:第3 s内线圈的发热功率最大

D:3~5 s内线圈有扩张的趋势

上一题 下一题 0.0难度 选择题 更新时间:2018-05-13 08:03:23

答案(点此获取答案解析)

B,D

同类题1

阅读下面短文,用括号内所给动词的适当形式填空(必要时可加情态动词或助动词)。
    “Everything happens for the best," my grandmother said whenever things weren't going my way. "Don't worry, one day your luck ____ (change). "
    Grandmother was right, as I discovered after graduating from college. I had decided to be sports announcer (广播员) in a radio station, so I ____  ( go) to Shanghai and knocked on the door of every station. But I got refused every time.
    In one station, a kind lady said my problem was short of experience. " Get some work with a small station and ____ (work) your way up ," she said.
    I couldn't get a job there, either. Then my dad told me a businessman had opened a company and needed someone ____  ( manage) the sports center. But again, I didn't get the job.
    I felt really down. "Your luck will change," Granny reminded me. I tried another radio station in Beijing. But the owner, a nice man, told me he already had someone.
    As I left his office, I asked, " How can someone be a sports announcer if he ____ (not, get) a job in a radio station?"
    I ____ ( wait) for the elevator when I heard the man call, " What was that you said about sports? Do you know anything about football?" I ____ (put) in front of a microphone and asked to imagine I was commenting (评论) on a football game. "Now you ____ (watch) the football game between Lu Neng and Shen Hua. . . "
    On my way home, Granny's words came back to me, " One day your luck will change, boy. And when it ____ ( happen) , it’ll feel twice as good because of all the disappointment (失望) you ____  ( have) . " At that moment I knew just what she meant.