two disks(one radius is R,the other radius is 2R)and a flat ring (inner radius is R,outter radius is 2R) each with the same uniform charge Q.Rank the objects according to the magnitude of the electric field they creat ar point P.(P is above the disks

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two disks(one radius is R,the other radius is 2R)and a flat ring (inner radius is R,outter radius is 2R) each with the same uniform charge Q.Rank the objects according to the magnitude of the electric field they creat ar point P.(P is above the disks

two disks(one radius is R,the other radius is 2R)and a flat ring (inner radius is R,outter radius is 2R) each with the same uniform charge Q.Rank the objects according to the magnitude of the electric field they creat ar point P.(P is above the disks
two disks(one radius is R,the other radius is 2R)
and a flat ring (inner radius is R,outter radius is 2R) each with the same uniform charge Q.Rank the objects according to the magnitude of the electric field they creat ar point P.(P is above the disks and ring,at the same level)

two disks(one radius is R,the other radius is 2R)and a flat ring (inner radius is R,outter radius is 2R) each with the same uniform charge Q.Rank the objects according to the magnitude of the electric field they creat ar point P.(P is above the disks
于是你的问题是什么...这里只有描述