Recent content by anonymousphys

w=pi/(.2) sin(wt) when t=(.2) equals 0. Hm..I think I'm not using the equation correctly?

Thanks for the reply. NABwsin(wt)=V comes from taking the derivative of NABcos(wt)=magnetic flux. The 2nd equation should be taking into account the change in angle. Shouldn't both equations lead to the same answer?

Homework Statement A 25-turn circular loop of wire has a diameter of 1m. In 0.2 seconds it is flipped 180 degrees at a location where the magnitude of the Earth's magnetic field is 50 micro T. What is the emf generated in the loop?Homework Equations -(dB/dt)(A)=VThe Attempt at a Solution When I...

Thanks for the reply. So, because of the turns on the coil, the magnetic field increases, but does the magnetic field increase because the current in the conductor creating the magnetic field increases? Or is there another reason for the change in magnetic field?

Homework Statement Do the number of turns on the loop magnify the current or the magnetic field? Homework Equations The Attempt at a Solution I believe its a magnetic field, but can someone confirm this? Thanks for any replies.

Homework Statement Assuming we have equal volumes in both scenarios, which would maximize the magnetic field in a solenoid: a thick and short wire or a thin and long wire. Homework Equations B=(m)(constant)(I)/(2R) m= the number of layers of wireThe Attempt at a Solution The answer is clearly...

Homework Statement Prove that the number of turns per length on a solenoid is equal to 1/(diameter). Homework Equations A= 2(pi)(R) The Attempt at a Solution number of turns= length/(2pi*radius) number of coils per length=(length/(2pi*radius))/length number of coils per...

Homework Statement Referring to the magnetic field in a solenoid: "The field at exterior points is weak because the field due to current elements on the upper potions tends to cancel the field due to current elements on the lower portions" Why do the upper and lower potions cancel the...

This is how I am picturing the forces: http://img100.imageshack.us/img100/1926/magnetic.png

Homework Statement A piece of wire has a mass of .5kg and length 3m is used to make a square coil .2m on a side. The coil is hinged along the horizontal side, carries a 3.4A current, and is placed in a vertical magnetic field of magnitude 2T. Determine the angle that the plane of the coil...

Thanks for the help, I get your explanation but... isn't the the spring just getting compressed? how do two forces create a torque about the spring?

Homework Statement A wire is formed into a circle having a radius of .02m and placed in a uniform magnetic field of 1*10^-4. A current of 5A passes through the wire. What is the range of potential energy the wire possesses for different orientations? Homework Equations torque=BIA...

Thanks for all the help so far. I am also picturing the current and magnetic field lying in the x and y plane; just like your diagram, each loop of the coil is in an x and y plane with a different z-value. But, won't this result in a compression of the coil not torque? The coil is similar...

Homework Statement When a does a capacitor increase in charge linearly? Homework Equations C=Q/V The Attempt at a Solution If I am correct, it is when the capacitor is being directly charged by a battery. When there is a resistor, we get an RC circuit scenario where capacitor...

Don't I get the force resulting from the magnetic field when I cross the current with the magnetic field? When I cross the current going around the loop, I am only taking the components perpendicular to the magnetic field. However, I am still getting a force that compresses the spring...