# Answer to Question #55897 in Electromagnetism for kola

Question #55897

19 A nichrome wire is 1.0m long and

1.0mm2

in cross-sectional area. It carries a current of 4.0 A when a potential difference of 2 V is applied between its ends. Calculate the conductivity of the wire.

(2MΩm)−1

(4kΩm)−1

(2mΩm)−1

(4Ωm)−1

20 The current I in a conductor as a function of time t is given as

I(t)=5t2−3t+10

where current is in ampres A and t is in seconds s. What quantity of charge moves across a section through the conductor during the interval t=2s to t=5s?

154.4C

193.5C

225.5C

300.0C

1.0mm2

in cross-sectional area. It carries a current of 4.0 A when a potential difference of 2 V is applied between its ends. Calculate the conductivity of the wire.

(2MΩm)−1

(4kΩm)−1

(2mΩm)−1

(4Ωm)−1

20 The current I in a conductor as a function of time t is given as

I(t)=5t2−3t+10

where current is in ampres A and t is in seconds s. What quantity of charge moves across a section through the conductor during the interval t=2s to t=5s?

154.4C

193.5C

225.5C

300.0C

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