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Given: Charge Q = at - bt². Find the current.

1. a - 2bt
2. a + 2bt
3. a - bt
4. a + bt

Correct answer: a - 2bt

Solution

Current (I) is the rate of change of charge (Q) with respect to time (t). Differentiating Q = at - bt² with respect to t gives dQ/dt = a - 2bt. Thus, the current is I = a - 2bt.

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