The potential difference across the terminals of a storage battery not connected in any circuit is observed to be 12 V. When it is connected to an external resistance the potential difference across the terminals is observed to be 11 V while the current in the external resistance is 3 A. What is the internal resistance of the battery?
A. 2.0 ohms
B. 0.33 ohm
C. 5.5 ohms
D. 1.0 ohm
E. Zero ohms
Answer: B
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What will be an ideal response?
A positive point charge Q is fixed on a very large horizontal frictionless tabletop. A second positive point charge q is released from rest near the stationary charge and is free to move
Which statement best describes the motion of q after it is released? A) Its speed will be greatest just after it is released. B) Its acceleration is zero just after it is released. C) As it moves farther and farther from Q, its acceleration will keep increasing. D) As it moves farther and farther from Q, its speed will decrease. E) As it moves farther and farther from Q, its speed will keep increasing.
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The plates of a parallel-plate capacitor are maintained with constant potential by a battery as they are pulled apart. During this process, the amount of charge on the plates
A) must increase. B) must decrease. C) must remain constant. D) could either increase or decrease. There is no way to tell from the information given.