9.如图所示竖直平面内有一�属环半径为a总电阻为r指拉 直时两端的电阻磁感应强度为b的匀强磁场垂直穿过环平面 在环的最高点a用 Template




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tomski9.如图所示竖直平面内有一�属环半径为a总电阻为r指拉 直时两端的电阻磁感应强度为b的匀强磁场垂直穿过环平面 在环的最高点a用 coloring