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1. Calculate charge and current

Homework Statement The region between concentric conducting spheres is filled with a material with conductivity σ and dielectric constant k. The inner sphere (radius a) is connected to the positive terminal of a battery with emf Vo, and the outer sphere (radius b) is connected to the...
2. Ohm's Law - coaxial conducting cylinder, find resistance and surface charge density

Homework Statement Consider two coaxial conducting cylinders with radii a and 3a and length L. The region a<r<2a is filled with a material of conductivity σ1, and the region 2a<r<3a has conductivity σ2. (Assume ε1=ε2=εo.) The inner cylinder is held at potential V0 and the outer cylinder at...
3. Ohm's Law - current within parallel plate capacitor imbedded in a large volume

Homework Statement A parallel plate capacitor with plates of area A and separation d is imbedded in a large volume filled with a material with electric conductivity σ. Determine the total current I if the two capacitor plates are maintained at a potential difference Vo. Explain how such a...
4. Electric current flowing through a resistor

ok, thank you!!!!!!!!!!!!!!!!!!!!!!!! :-)
5. Electric current flowing through a resistor

Ok, I dont mean to be a pain... but how do I work out the equivalent resistance between the two dots (i.e. within the two loops)? If you could explain with a little more detail, I would appreciate it. I don't expect the answer to the problem, just a more direct explanation of how to find the...
6. Electric current flowing through a resistor

Ok, so R2 and R5 are in series, so their equivalent resistance is 3ohm+3ohm=6 ohm. So, does that mean the current flowing through these 2 resistors is I=V/R, or I=10.4/6=1.73 A? And because they are in series and because it is the same current through both, that means the current through R2 is...
7. Electric current flowing through a resistor

Ok, so I have found the equivalent resistance to be 8ohm, and the current across the equivalent resistance to be I=V/R=10.4/8=1.3 A. But, I am stuck as to what to do next. I don't know why, but I feel weak as to the theory behind individual resistors and current, voltage, etc across them. :-(
8. Electric current flowing through a resistor

Homework Statement Consider the electric circuit shown in the figure. Assume that V = 10.4 V, R1 = R2 = R3 = R4 = R5 = 3.00 Ohm. What is the electric current flowing through resistor R2? I couldn't upload the figure, but you can find it on my cramster.com post...
9. Two charged capacitors cross connected to each other

Homework Statement Capacitors C1 = 6.99 mF and C2 = 1.72 mF are charged as a parallel combination across a 219 V battery. The capacitors are disconnected from the battery and from each other. They are then connected positive plate to negative plate and negative plate to positive plate...