Charge through a cross-section of a conductor is given by \( Q=5 t^...

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Charge through a cross-section of a conductor is given by \( Q=5 t^{2}-2 t \) coulomb. Find the average current through the conductor in the interval \( t_{1}=2 \mathrm{~s} \) to \( t_{2}=4 \mathrm{~s} \).
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