矩形金属线框置于匀强磁场B中,线框平面与磁场垂直,并且一条边置于磁场边缘,如图所示。线框的边长为l<sub>1</sub>、l<sub>2</sub>,电阻为R。现以速度ν把它从磁场中拉出来,外力F做的功是 ( )<img src='https://img2.soutiyun.com/ask/6078001-6081000/e4154b11904cad584ad5df3bbfff62ab.jpg' />

A.<img src='https://img2.soutiyun.com/latex/latex.action' /> B.<img src='https://img2.soutiyun.com/latex/latex.action' /> C.<img src='https://img2.soutiyun.com/latex/latex.action' /> D.<img src='https://img2.soutiyun.com/latex/latex.action' />

时间:2023-08-21 14:48:08

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