a)r=14.14
The magnetic field for B is 1.132x10^-6 and it is moving upward
I think that I have misread the question for part B, I just need to find out the magnetic field of the lower left point and use the force equation F=current times magnetic field times length to find out the force for the...
Homework Statement
Four long copper wires are parallel to each other, their cross sections forming the corners of a square with sides a=20cm. A 20A current exists in each wire in the direction shown in the diagram.
http://i41.tinypic.com/2uiw6ck.jpg
a) What are the magnitude and direction of...
I have re-read the textbook again, and I found out that the direction of the force is always perpendicular to the B, and if you use the right-hand rule, fingers point straight along the current and bend to get B, which means that B is also perpendicular to current...so I am kind of confused now...
a)F=current x length x uniform magnetic field x sinθ
x-direction:
F=(-i x B x sqrt(l^2+l^2))+(i x B x l x sin 45) + (i x B x cos 45)
y-direction:
F=(-i x B x l)+(i x B x l x cos45)+(i x B x l x tan45)
b) direction of magnetic dipole moment: 45 degree respect to the horizontal negative...
Homework Statement
A current i flows through a triangular loop in the y-z plane. The loop is situated in a uniform magnetic field B.
http://s5.tinypic.com/14csew3.jpg
a) Find the total force on the loop when the magnetic field is in i) the x-direction, and ii) the y-direction
b) What is the...
Homework Statement
For the reaction A-->2B+C, the following data are obtained for [A] as a function of time: t=0min, [A]=0.80M; 8min, 0.60M; 24min, 0.35M; 40min, 0.20M.
Calculate the rate of formation of B at t= 28 min. The Attempt at a Solution
I have found out that this equation is a first...
Sorry, I don't really get what you were saying... I think that all the eight points have the same potential and should since there are no extra battery in the circuit. should I connect all the point diagonally with wires? but the question says each side of the cube has the resistance of r and i...
Homework Statement
Find the resistance between the points a and b for the resistor network shown.
http://s5.tinypic.com/1073kvd.jpg
The Attempt at a Solution
I changed to 3D cube into a 1D square and each side of the square contains 3r because each side of the cube contains an r(for...
Homework Statement
The peak value of an alternating current in a 1500W device is 5.4A. What is the rms voltage (root-mean-square voltage)across it?
The Attempt at a Solution
Peak current=sqrt(2)*Irms
5.4A=sqrt(2)*Irms
Irms=3.82A
Irms=P/Vrms
3.82=1500/Vrms
Vrms=392.84V
I am not sure...
there are 0.052 moles of copper
0.103 moles of electrons (2 electrons transferred in copper)
I am not really sure about the moles of hydrogen gas but since there are 2 moles of electrons and 1 moles of hydrogen gas, I think that the moles of hydrogen gas is 1/2 of the moles of electrons...
HELP!A problem on quantitative aspects of electrolysis
Homework Statement
A quantity of electric charge brings about the deposition of 3.34 g Cu at a cathode during the electrolysis of a solution containing Cu2+(aq).
What volume of H2(g) measured at 27.8oC and 767 mmHg, would be produced by...
Sorry, but I still think that DT should be 0-20=-20, because the values of α for both copper and nichrome are at 20 degree celsius.
Or do you mean radomly select numbers and plug into the equation to solve the problem? However, I don't really know how to solve the problem in this way...
I...
Do you mean that R=[1+α(T-To)] for both carbon and nichrome resistor?
α for carbon resistor is -0.0005 and α for nichrome resistor is 0.0004
If R=[1+α(T-To)], then R for carbon would be 1.01 and R for nichrome would be 0.992
where T=0 and To=20 since we are trying to find the resistance at...