12:38 PM * session.masteringphysics.com Problem 29.3 MasteringPhysics ..ooo AT&T

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12:38 PM * session.masteringphysics.com Problem 29.3 MasteringPhysics ..ooo AT&T; @7696. Problem 29.3 Two 5.0mn × 5.0mm electrodes with a 0.10-mm-thick sheet of Mylar between them are attached to a 7.0 V battery. Without disconnecting the battery, the Mylar is withdrawn. (Very small spacers keep the electrode separation unchanged.) Part A What is the charge before and after the Mylar is withdrawn? Express your answer using two significant figures. Enter your answers numerically separated by a comma. Obefore, Qafter- pC Submit Give Up Incorrect; Try Again; 3 attempts remaining Part B What is the potential difference before and after the Mylar is withdrawn?

Explanation / Answer

Part A:

Parallel plate cap
C = r(A/d) in Farads
is 8.8542e-12 F/m
r is dielectric constant (vacuum = 1)
A and d are area of plate in m² and separation in m
Q = CV , Also we will consider dielectric constant of Mylar = 3.1

initial C = (8.85e-12)(3.1)((0.005²)/(0.0001)) = 6.86e-14 F
final C = above/3.1 = 2.21e-14 F

Part B:

V initial = 7.0 volts
V final = 7.0 volts

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