1. The electric field strength 5.0 cm from a very long charged wire is 2700 N/C.

Question

1. The electric field strength 5.0 cm from a very long charged wire is 2700 N/C.

A: What is the electric field strength 10.0 cm from the wire?

Express your answer to two significant figures and include the appropriate units.

E = ??

NOTE: THE ANSWER IS NOT 1350, -1350

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2. A parallel-plate capacitor is formed from two 2.8 cm -diameter electrodes spaced 2.7 mm apart. The electric field strength inside the capacitor is 2.0 ×106N/C.

A: What is the charge (in nC) on each electrode?

Express your answer using two significant figures.

Q = ???

NOTE: THE ANSWERS 3.47 nC, 3.468 nC ARE NOT CORRECT

Explanation / Answer

1. E = lambda / (2 pi e0 r)

E r = constant

(2700)(5 cm) = E ( 10 cm)

E = 1350 N/C

in two significant digits: Ans: 1300 N/C

2. E = sigma/ e0 and sigma = Q / A

2 x 10^6 = Q / (pi (1.4 x 10^-2)^2)(8.854 x 10^-12)

Q = 11 x 10^-9 C Or 11 nC

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