1. D

    wire frames and dynamo

    Hi I have the query of the following nature: In Fig. 1, a wire frame ABCD) is drawn in a homogeneous magnetic field B = 0.10 T . The points P and Q are connected to a voltmeter. Then the wire frame is mechanically driven. In this case side AD moves forward in the position shown (paper...
  2. P

    Question about perminant magnetic fi induced in steel plates by current carrying wire

    I'm relatively new to picking up advanced physics as a hobby, currently on special relativity and field theory, and I was hoping to help explain something to my brother. He's interested in a phenemonon possibly discovered by someone living in florida in the 20-50s named Ed Leedskalnin, who...
  3. C

    Loop of wire falling out of a magnetic field.

    I am struggling on finding the time it takes the loop of wire to completely leave the field in part a. I have found the differential equation of motion to me dv/dt+at=g where a is a constant determined to be a=826.72. I found the solution of the DE to be v(t)=g/a(1-e^(-at)) I have tried...
  4. N

    I am confused with center of mass for wire right triangle. Help!

    Hey guys, So far, I finished 1, 2, and 4. However, I am stuck with Q3. How do I solve it? I really have no idea where to start. It's just a wire bend to form a right triangle. Any help would be appreciated!
  5. avito009

    Does the copper wire holding the current lose mass?

    Does the copper wire holding the current lose mass? We know that electrons have mass and when a copper wire holds a current then the electrons from the copper wire are made to move and that is electricity. So does this result in mass loss for the copper wire? What is electricity? Electric...
  6. B

    Question for the resistance of the wire

    I think about that question many times for few days, but I still cant find out the correct answer! Maybe my steps are somethings wrong, please advise me! Thanks! A copper rod, 0.4m long and 4.0mm in diameter, has a resistance of 550μΩ at 20℃. Calculate the resistivity of copper at that...
  7. B

    Current on connecting wire

    Help required to understand basic physics concept Whether the current in connecting wire is more or less, compared with the current in the white hot filament of a common lamp? How can we find out? Thanks
  8. J

    Point Charge and Infinite Wire

    Hello, I am new in this forum and I am having problems solving the following question: Statement: A long straight and thin wire has a charge Q per unit length. It is also carrying a current I. A point charge is moving with a velocity v parallel to the conductor, at a distance d from it...
  9. D

    Magnetic field around wire with AC current

    Hello, I would appreciate any help with regard to the following question. I have an infinitely long and thin wire with a curent passing through it. The current can be described with the equation: i(t) = A*sin(2*PI*f*t). What will be the magnetic field at a distance r from the wire? I've heard...
  10. A

    Bead on a wire of arbitrary shape

    The problem is the following: A bead slides without friction down a wire that has the shape y = f(x) (Y is vertical and X is horizontal). Show the equation of motion is that defined in the uploaded picture. I believe that there is a missing factor of 2 in the middle term. 2 should...
  11. A

    How does an electric field produce a potential difference across a wire?

    This is a conceptual question. I hope that's okay. I've created a small circuit with an arduino that receives input from a copper wire connected to an analog pin, similar to what is shown in this tutorial: http://www.instructables.com/id/Arduino-EMF-Detector-1/ The arduino reads the...
  12. E

    Wire bent into a shape, calculate angle at centre

    Hi, this is my first post so please be nice! I am completely clueless where to start for this question, I've been thinking about it for about an hour now with no success. Can someone start me off please? Thanks, Epson
  13. S

    Ga-In Eutectic wire Contact

    Hi there, Does anybody here knows how to use a Gallium Indium Eutectic paint for making a contact with n type Silicon. I used a cotton swab to paint thin layer of Ga-In to n-Si but the problem is it doesn't dry even after 24 hours and i want to make a wire contact to that part so does anybody...
  14. F

    Is EMF generated in this special loop of wire

    A square loop of wire is kept hanging upright and has 3 sides made of copper and the lower horizontal side made of iron. The loop has its surface normal to a uniform magnetic field B. The question is: If the loop is allowed to fall while fully immersed in this field B, will an EMF be generated...
  15. C

    Live and Neutral wire

    What is the difference btween live wire and neutral wire? also why cant a live wire only be used in domestic circuit? what is the use of a neutral wire?
  16. B

    What is the specification of the rebar tie wire and loop wire ties?

    How can i learn the specification of the rebar tie wire and loop wire ties?
  17. P

    Force on the wire (uniform magnetism)

    Hello, it's my first time here! I'm taking physics in college and I went on a trip with my family and I got this problem I'm having trouble with. Help on how to get started? A semi-circle piece of wire of radius R with current I is situated around the origin as shown below. What is the force...
  18. A

    Induction in a loop of wire

    Hi there the problem given is: A circular loop of wire can be used as a radio antenna. If a 22.0-cm-diameter antenna is located 2.20km away from a 95.0-MHz source with a total power of 55.0kW, what is the maximum emf induced in the loop? (Assume that the plane of the antenna loop is...
  19. Z

    Electric field of a thin/thick wire?

    The circuit shown above consists of a single battery, whose emf is 1.4 V, and three wires made of the same material, but having different cross-sectional areas. Each thick wire has cross-sectional area 1.4e-6 m2, and is 21 cm long. The thin wire has cross-sectional area 6.4e-8 m2, and is...
  20. K

    Tension in a wire

    a piece of wire is connected on the ends of a metal rod. A 10kg mass is hung from the wires midpoint,in the process 20 degree angles are formed on both ends of the wire. Wat is the tension in the wire? Am not sure but i was thinkin of using the formula t=mg/COS 20