Hi, need some help on physics questions. Question 1: Three capacitors, with capa

Question

Hi, need some help on physics questions.

Question 1:
Three capacitors, with capacitances C1 = 5.6 %u03BCF, C2 = 2.7 %u03BCF, and C3 = 3.5 %u03BCF, are connected to a 20 -V voltage source, as shown in the figure. What is the charge on capacitor C2 ?

Question 2:
A narrow copper wire of length L and radius b is attached to a wide copper wire of length L and radius 2b, forming one long wire of length 2L. This long wire is attached to a battery, and a current is flowing through it. If the electric field in the narrow wire is E, the electric field in the wide wire is

E.

2E.

E/2.

4E.

E/4.

Explanation / Answer

The electric field is proportional to 1/r. So if r is doubled then E is reduced by a factor of 2

E/2.

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