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一、两种方法的比较例1有一边长L=0.1 m的正方形导线框abcd,质量m=100 g,由高度h=0.2 m处自由下落,其下边ab进入匀强磁场区域后,线圈开始做匀速运动,直到其上边cd刚刚开始穿出匀强磁场为止.此匀强磁场区域的宽度也是L.求线框在穿越匀强磁场过程中产生的焦耳热.(g取10 m/s~2)解法1:线框在磁场中运动产生的感应电动势E=BLv.线圈匀速运动时的受力mg=F=BIL,所以I=
One and two methods of comparison 1 have a square lead frame abcd of length L=0.1 m on one side, mass m=100 g, free fall from height h=0.2 m, and the lower side ab enters the uniform magnetic field, the coil starts Do a uniform motion until the upper cd has just begun to wear a uniform magnetic field. The width of the uniform magnetic field is also L. Find the Joule heat generated by the wireframe during the passage of a uniform magnetic field. (g takes 10 m/s~ 2) Solution 1: The induced electromotive force generated by the movement of the wireframe in the magnetic field E=BLv. The force at the uniform movement of the coil is mg=F=BIL, so I=