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6 C of charge traverses a 100 ohm resistor in 1 minute. What voltage is needed to drive this charge through the resistor?
A1000 volt
B0.1 volt
C6 volt
D10 volt
Answer & Solution
Correct answer: D. 10 volt
1. First find the current from the charge and the time: I = deltaQ / deltat.
2. deltat = 1 min = 60 s, so I = 6 C / 60 s = 0.1 A.
3. Apply Ohm's law: V = IR = (0.1 A)(100 ohm) = 10 V.
4. Using 6 C directly as the current instead of dividing by time would wrongly give 600 V, not any listed option.
_Source: OpenStax Physics (CC BY 4.0), Ch 19 "Electrical Circuits", section 19.1 Ohm's law_
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