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A student working in the physics laboratory connects a parallel-plate capacitor to a battery, so that...

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Physics

A student working in the physics laboratory connects aparallel-plate capacitor to a battery, so that the potentialdifference between the plates is 225 V. Assume a plate separationof d = 1.27 cm and a plate area of A = 25.0cm2. When the battery is removed, the capacitor isplunged into a container of distilled water. Assume distilled wateris an insulator with a dielectric constant of 80.0.

(a) Calculate the charge on the plates (in pC) before and afterthe capacitor is submerged. (Enter the magnitudes.)

before Qi = ___ pC

after Qf = ___ pC

(b)

Determine the capacitance (in F) and potential difference (in V)after immersion.

Cf = ___ F

ΔVf = ___ V

(c) Determine the change in energy (in nJ) of the capacitor.

ΔU = ___ nJ

(d)

What If? Repeat parts (a) through (c) of theproblem in the case that the capacitor is immersed in distilledwater while still connected to the 225 V potential difference.

Calculate the charge on the plates (in pC) before and after thecapacitor is submerged. (Enter the magnitudes.)

before Qi = ___pC

after Qf = ___ pC

Determine the capacitance (in F) and potential difference (in V)after immersion.

Cf = ___ F

ΔVf = ___ V

Determine the change in energy (in nJ) of the capacitor.

ΔU = ___ nJ

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