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2. Two rods are joined end to end as shown; both have a cross- sectional area of 0.01 cm. Each is 1 m long.

2. Two rods are joined end to end as shown; both have a cross- sectional area of 0.01 cm. Each is 1 m long. One rod of copper while the other is of iron. How much potential difference V is required to produce a current of 1 A in the rods? Cu Fe

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