Ahh ok, thanks for the reply. I'd much rather you corrected me when I'm wrong :-)
I think I was supposed to derive it, but I have no idea where to start. This is causing me untold misery!
Thanks again.
Homework Statement
A current carrying loop of wire is being monitored using a Hall-effect magnetic field probe placed at its centre. The loop is in air and has a radius of 0.5 m. It is required to monitor the magnetic flux in order to trip the circuit breaker if the current exceeds 100 A...
r13 = (2, -2), unit vector r = root 2 / 2 in the x direction - root 2 / 2 in the y direction,
F13 = Q1Q3 * unit vector / 4 PI Epsilon nought r^2
(with r = 2)
Homework Statement
A charge +2nC is located at (0, 2 m). Another +2 nC charge is
located at (0, -2 m). A third charge, +3 nC, is located at (2 m, 0).
Calculate the total force (in vector form) acting on charge +3nC
from both +2nC charges.
Homework Equations
Coulomb's law in vector form
The...
The current enters the dotted terminal of L1. My understanding is, that means a positive voltage will be induced at the dotted terminal of L2.
Going round the circuit in the direction of the current, wouldn't this produce a voltage rise across L2 (from undotted to dotted terminal)? In other...
Homework Statement
Determine the polarity of the induced voltages in L1 and L2.
[PLAIN]http://img406.imageshack.us/img406/730/31761140.jpg [Broken]
According to the dot convention rule, when current enters the dotted terminal of a coil,the polarity of the voltage it induces in the other coil...
[PLAIN]http://img30.imageshack.us/img30/3306/counterty.jpg [Broken]
Is this an asynchronous down counter, or is it nonsense? (Assuming all J and K inputs are connected high)
Trivial question, I know :-)
Homework Statement
Two point charges, q1 = -2nC & q2 = +5nC are 4 cm apart. What is the force on q1? What is the force on q2? (Magnitude and Direction)
Homework Equations
F = kq/r^2
k = 9x10^9
The Attempt at a Solution
Using that formula, I calculated q1 to equal -45kN and q2 to...