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The amount of charge q (in C) passing through a surface of 2 cm?
changes over time as q = 4t3 +5t +6. (Here t is in seconds.) What is the
value of the current density for t=1 s?
80 kA/m²
b) O 95 kA/m?
c) 90 kA/m²
d) O 100 kA/m²
e) 85 kA/m²

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