用一根横截面积为s电阻率为 ρ 的硬质细导线做成一个半径为r的圆环ab 为圆环的一条直径如图所示在 Ab 的左侧存在一个匀强磁场磁场 Template




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tomski用一根横截面积为s电阻率为 ρ 的硬质细导线做成一个半径为r的圆环ab coloring