A parallel-plate capacitor is made from two aluminum-foil sheets, each 6.2 cm wi

Question

A parallel-plate capacitor is made from two aluminum-foil sheets, each 6.2 cm wide and 6.2 m long. Between the sheets is a Teflon strip of the same width and length that is 4.5×102 mm thick.

Part A

What is the capacitance of this capacitor? (The dielectric constant of Teflon is 2.1.)

Express your answer using two significant figures.

1.67•10141.67{cdot}10^{-14}

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A parallel-plate capacitor is made from two aluminum-foil sheets, each 6.2 cm wide and 6.2 m long. Between the sheets is a Teflon strip of the same width and length that is 4.5×102 mm thick.

Part A

What is the capacitance of this capacitor? (The dielectric constant of Teflon is 2.1.)

Express your answer using two significant figures.

1.67•10141.67{cdot}10^{-14}

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Incorrect; Try Again; 2 attempts remaining

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Explanation / Answer

A = (6.2 x 10^-2) (6.2) m^2

d = 4.5 x 10^-5 m

dielectric constant for teflon, K = 2.1

C = k e0 A /d

= (2.1)(8.854 x 10^-12) (6.2 x 6.2 x 10^-2) / (4.5 x 10^-5)

= 159 x 10^-9 F or 159 nF

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