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OpenStudy (anonymous):
The charge passing from a conductor varies according this formula: q=5t3+3t2+4. What is the current at t=2s ? Suggested answer is: 72 A I = dq/dt = q! (as in q prime) = 15t2 + 6t = 15(4) + 6(2) for t= 2s (seconds) = 72A (Amperes) Long time since diffy Qs. Appreciate any insight or a lesson reference to help understand.
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