Two rods are joined end to end, as shown. Both have a cross-sectional area of 0.01 cm2. Each is 1 meter long. One rod is of copper with a resistivity of 1.7 $ \times $ 10$-$6 ohm-centimeter, the other is of iron with a resistivity of 10$-$5 ohm-centimeter. How much voltage is required to produce a current of 1 ampere in the rods?

Question

Two rods are joined end to end, as shown. Both have a cross-sectional area of 0.01 cm². Each is 1 meter long. One rod is of copper with a resistivity of 1.7 $ \times $ 10^$-$6 ohm-centimeter, the other is of iron with a resistivity of 10^$-$5 ohm-centimeter.

How much voltage is required to produce a current of 1 ampere in the rods?

0.00145 V

0.0145 V

1.7 $ \times $ 10^$-$6 V

0.117 V

Solution

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