Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1 mm. Conductor B is a hollow tube of outer diameter2 mm and inner diameter 1 mm. The ratio of resistance RA to RB is .......... .

Two conductors are made of the same material and have the same length.

1.	Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1 mm. Conductor B is a hollow tube of outer diameter2 mm and inner diameter 1 mm. The ratio of resistance RA to RB is .......... .
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Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1 mm. Conductor B is a hollow tube of outer diameter2 mm and inner diameter 1 mm. The ratio of resistance RA to RB is .......... .​

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Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1 mm. Conductor B is a hollow tube of outer diameter2 mm and inner diameter 1 mm. The ratio of resistance RA to RB is .......... .