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A parallel-plate capacitor with only air between the plates is charged by connecting it to a battery. The capacitor is then disconnected from the battery, without any of the charge leaving the plates.
A) A voltmeter reads 46.0V when placed across the capacitor. When a dielectric is inserted between the plates, completely filling the space, the voltmeter reads 14.5V . What is the dielectric constant of this material?
B) What will the voltmeter read if the dielectric is now pulled partway out so it fills only one-third of the space between the plates?
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A small particle has charge -2.30\mu C and mass 3.00×10^-4kg . It moves from point A, where the electric potential is V_A = 120V , to point B, What is its speed at point B
A 0.105-kg ball is dropped from rest. If magnitude of the ball's momentum is 0.790 kg · m/s just before it lands on the ground, from what height was it dropped.
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