如图所示电阻为2r的�属环沿直径装有一根长为l电阻为r的�属杆.�属环的一半处在磁感应强度为b垂直环面的匀强磁场中现让�属环的一半 Template




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tomski如图所示电阻为2r的�属环沿直径装有一根长为l电阻为r的�属杆.�属环的一半处在磁感应强度为b垂直环面的匀强磁场中现让�属环的一半 coloring