I have homework in physics

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I Have Homework in Physics 2 in subject Electricity and Magnetism and i need to get on it at least 95%

PHYS 206.002: Electricity and Magnetism
Assignment: Week 7
1. (25 points) (Problems 23 in textbook / Chapter 26)
Four capacitors are connected as shown below. (a) Find the equivalent capacitance between point a and b. (b)
Calculate the charge on each capacitor, taking ∆Vab = 15.0 V
2. (25 points) An air-filled spherical capacitor is constructed with inner- and outer-shell radii of 7.00 cm and
14.00 cm, respectively. (a) Calculate the capacitance of the device. (b) What potential difference between the
spheres results in a 4.00 C charge on the capacitor?
1
3. (25 points) (Problems 49 in textbook / Chapter 26)
A 2.00 nF parallel-plate capacitor is charged to an initial potential difference ∆Vi = 100 V and is then isolated.
The dielectric material between the plates is mica, with a dielectric constant of 5.00. What is the potential
difference across the capacitor after the mica is withdrawn?
4. (25 points) A parallel-plate capacitor has a plate separation d and plate area A. An uncharged metallic slab
of thickness a is inserted midway between the plates. Find the capacitance of the device.
2

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