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A length of wire has a resistance of 10 ohms. What is the resistance of a wire of the same material three times as long and twice the cross-sectional area?

A. 30 ohms

B. 20 ohms

C. 15 ohms

D. 7 ohms

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    A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 10^-6
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