Homework Statement
"The current in a 1.70mm x 1.70mm square aluminum wire is 1.70 A. What are (a) the current density [in MA/m^2] and (b) the electron drift speed [in micrometers/second]?"
Homework Equations
J = I/A
The Attempt at a Solution
I plugged in the values for current...
Homework Statement
"Two 2.1cm x 2.1cm plates that form a parallel-plate capacitor are charged to +- 0.705 nC. What is the potential difference across the capacitor if the spacing between the plates is 1.20mm? "
Homework Equations
C = Q/V
C = epsilon * A/d
The Attempt at a Solution
I...
Homework Statement
What is the electric potential at the point indicated with the dot in the figure?
http://img842.imageshack.us/i/29ex26.jpg/
Homework Equations
E = V_c / d ?
V = E*s?
V = k * q / r ?
The Attempt at a Solution
I'm really rather confused by this problem...
Homework Statement
"Two point charges 2.0cm apart have an electric potential energy -180 microJoules. The total charge is 31 nC. What are the two charges?"
Homework Equations
V= k * q / r
The Attempt at a Solution
I understand that V = -180 * 10^-6, k = 9*10^9, r = 0.02m, and the...
The potential difference necessary to accelerate an He+ ion....?
Homework Statement
"What potential difference is needed to accelerate a He+ ion (charge +e, mass 4u) from rest to a speed of 1.2×10^6 m/s?"
Homework Equations
K_f + q*V_f = K_i + q*V_i
The Attempt at a Solution
I figure...
Homework Statement
Two circular disks spaced 0.50 mm apart from a parallel-plate capacitor. Transferring 1.90 x 10^9 electrons from one disk to the other causes the electric field strength to be 1.90 x 10^5 N/C. What are the diameters of the disks (in cm)?
Homework Equations
E = Q /...
Hello all - this is my first time giving this forum a try. I've been using another site for a while but it's just too spotty and not enough folks there care to give decent responses, so here I am :)
Homework Statement
http://img684.imageshack.us/i/27p28.jpg/
What are the strength and...