Electric Circuits Answers

hi , i am experimenting on MFC operation under diffrent loads of 1000 ohm ,2000 ohm ,3000 ohm ; but the best load achieving current density and power density was 2000 ohm, how can i explain that 2000 ohm is better than the 1000 ohm.

Three charges q, 2q and q are to be placed on a straight wire of length 10 m. Determine the positions where the charges should to be placed so that the electrostatic potential energy of the system is a minimum.

A conducting wire has a 1.0 mm diameter, a 2.0 m length, and a 50 mΩ resistance, What is the resistivity of the material?

An example Capacitor is 24v and 1500μF and has a time constant of 0.15 Seconds.
I need to determine (using a discharge equation) the total charge, in coulombs discharged in the first 5 time constants and then predict how long it would take to discharge to 0.03 coulombs.

How does dirty speed of electrons change as they move through resister?
Increases or decreases or remains the same?

Constant current flows through conical conductor. Conductor has 2 end surfaces, one with small surface and the other with greater surface. To which surface does greater current flow?

What area of the plates of parallel- plate capacitor gives 1F, if the seperation of the plates is 1mm and the plates are in vacuum

if the temperature of a battery connected conducting resistance wire reduces by cooling process then how current in it will change?

If a scan takes 30 minutes to complete, how much charge has flowed through the scanner in total? Assume that the current is constant and equal to 84.3 A.

How much energy does a 2400 watt microwave oven use in 3 minutes?