Two metal electrodes of size 2.0 cm \\times 2.0 cm are spaced 1.3 mm apart and c

Question

Two metal electrodes of size 2.0 cm imes 2.0 cm are spaced 1.3 mm apart and connected by wires to the terminals of a 9.0 { m V} battery.

A- What is the charge on each electrode?
Express your answer using two significant figures. Answer Q1= __25_____pC.

B- What is the potential difference between electrodes?
Express your answer using two significant figures. Answer Delta V1= ________V

C- The wires are disconnected, and insulated handles are used to pull the plates apart to a new spacing of 2.0 mm.
What is the charge on each electrode?
Express your answer using two significant figures. Answer Qf= _________pC

D- What is the potential difference between electrodes?
Express your answer using two significant figures. Answer Delta Vf=_________ V

Explanation / Answer

a) C= e0 2E-2^2/1.3E-3=2.72 pF now use Q=CV=2.72pF*9V=25pC b) since its hooked up to a battery V=9V c) there is no where for the charge to go so Q = 25 pC d) now we use Q=CV but now C= e0 2E-2^2/2E-3=1.77E-12 F so V= Q/C=25pC/1.77pF=18 V

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