Electric Circuits Answers

we have a rectangular page in dimensions l&w which has a very thin layer of graphite with a diameter of d(100nm)
Design an experiment to calculate the electrical resistance of this page?

Calculate the resistance of 180 m of silver wire having a cross section of
0.33mm2
. The resistivity of silver is
1.6×10−8Ωm

0.40 mm diameter copper wire carries a current of
3μ.
Find the current density in the wire

I am studying induction cookers.
What would happen if i placed 2 or more small induction coils in close proximity (say a cm apart) and turned them all on? Also, why do they have only circular coils? Can it be rectangular/ triangular?

An analog triangular 1 KHz signal is sampled at 8 kbps. Draw the necessary circuit and
the output waveform (with timescale), if peak signal amplitude is 4mV.

In early set of experiments (1911), Millikan observed that the following measured charges, among others, appeared at different times on a single oil drop. What value of elementary charge can be deduced from these data?
a. 6.563 x 10 exponent -19 C
b. 8.204 x 10 exponent -19 C

http://media.cheggcdn.com/media/19b/19bb0153-4862-413f-bd69-5ffe7eef40ef/php8VZDXj.png

In the figure, a 100 mA current flows through a copper wire 0.10 mm in diameter, a 1.0 cm diameter glass tube containing a salt solution, and a vacuum tube where the current is carried by an electron beam 1.0 mm in diameter. The density of conduction electrons in copper is 1.1×10^29 m^-3. The current in the solution is carried equally by positive and negative ions with charges +/- 2e, the density of each ion species is 6.4×10^23 m^-3 . The electron density in the beam is 2.1×10^16 m^-3.

a) Find the drift speed in the salt solution. Express your answer using two significant figures in mm/s.
b) Find the drift speed in the electron beam. Express your answer using two significant figures in mm/s.

if four cells of emf E each are connected in parallel the resultant emf will be