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7. A solid. rectangular lead bar at 20 C has the dimensions shown in the diagram. The resistivity of lead at 20 C is 22

7. A solid. rectangular lead bar at 20 C has the dimensions shown in the diagram. The resistivity of lead at 20 C is 22 x 10-8 2.m. Find the resistance between the pair of opposing faces 20 cm (20 cm by :30 cm). 900 cm 30 cm

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