Copper Definition and 513 Threads

I was wondering what voltage or current, if any, would be produced if the basic magnet through a copper coil experiment had the poles rotated 90 degress so north and south faced the top/bottom of the coil rather than the entry/exit points? The attached image has a basic illustration of this...

Can someone please help me on this physics question The mass of a copper atom is 2.50 10-25 kg, and the density of copper is 8 920 kg/m3 . (a) Determine the number of atoms in 1 cm3 of copper. (b) Visualize the one cubic centimeter as formed by stacking up identical cubes, with one...

i need to dissolve a copper nail completely what chemical can do that and how much time is enough to form the reaction , i thought about sulphuric acid as a reactant but i don;t know if it dissolve it completely or partially !

Homework Statement Use approximations to find the number of free electrons in a 4mm diameter solid sphere of copper. What fraction of its electrons have to be removed to leave a sphere with a charge of +50μC? Note that density of 29_Cu is 8.96 g/cm^3 and molar mass 63.54g/mol Hint: Atomic...

Writing the electronic configuration of Cu : [Ar] 4s13d10, I feel that the number of valence electrons in a copper atom is 11. But it doesn't make any sense to me why copper has a valence of 1 or 2 as in case of CuSO4 ... which is 2. Going the usual way, if we consider Sodium, which has an...

Hi, I am trying to understand the formation of Copper pairs in a superconductor. However, 2 major explanations I found in the internet: 1, Cooper pairs are formed by emitting and receiving phonons between 2 electrons. 2, another explanation is, when an electron drifting between the...

Homework Statement Basically I'm doing a lab report where we place copper pennies in a solution of salt and vinegar. This should strip the copper oxide off the outside of the pennies, leaving the copper underneath shiny and looking "new". The problem is why we add the salt. Homework...

Homework Statement If we drop a bar magnet down a copper tube, it will travel down very slowly. If we now cut vertical slits in the copper tube, will the magnet travel down faster or slower as compared to the original problem? Homework Equations \int \vec E \cdot d \vec l = -\frac{d...

Homework Statement The figure shows a ring of copper with its plane perpendicular to the axis of the nearby rod-shaped magnet. For each of the situations described below, indicate whether there will or will not be a current induced in the ring and justify your reasoning, drawing pictures if...

Hi. I am wondering how I can diagnose a winding and find out whether it is damaged. Windings like for solenoids or electromagnets operating on 12VDC. Or even for 12V motors. I want to know how I can detect a turn to turn shorted winding. Does an electromagnet lose magnetic power and...

I had a solution of copper sulfate in (vinegar) and noticed that when I wire brushed certain metals, the copper made a beautiful arrangement on the work piece, often a perfect semi-gloss. The copper is also seemingly bonded to the metal ( can't wipe it off). However, when I use conventional...

Homework Statement In the circuit shown, two thick copper wires connect a 1.5 V battery to a Nichrome wire. Each copper wire has radius R = 7 mm and is L = 18 cm long. Copper has 8.4 × 10^28 mobile electrons per cubic meter and an electron mobility of 4.4×10^−3 (m/s)/(V/m). The Nichrome wire...

I heard a rumor from some people at a scrap yard that it's impossible to sepperate copper from stainless steel, and that the copper ruins the stainless steels structual integrety. Is there any truth to this?

Homework Statement A strip of copper 10 mm wide and 700 micrometers thick is placed in a uniform mag. field B magnitude 0.9 T, with B perpendicular to the strip. A current i = 45 A is then sent through the strip, such that a Hall Potential difference V appears across the width of the strip...

The title is pretty self-explanatory. I know the speed of the falling magnet is much slower in a copper pipe, but since the magnetic field moves, is there still some electricity generated in the process, even though the speed isn't great? Thanks!

Hi, this is my first post here. I know that, according to Lenz's law, if you drop a magnet inside a copper tube and let it fall, its movement will cause an induced current, which will slow it down in turn. However, my drawings make me believe that the direction of such current should be one...

Homework Statement What diameter must a copper wire have if its resistance is to be the same as that of an equal length of aluminum wire with diameter 3.94mm? Give your answer in mmHomework Equations R = ρL/A where A is the cross sectional area, L is the length and ρ resistance of the...

Homework Statement I was wondering, how can i measure the specific heat capacity of a solution? Not the exercise, just doing an experimental work to measure it. Homework Equations q=mct The Attempt at a Solution I'm lost.

Homework Statement An isolated solid copper sphere of radius .12m has a positive charge of 6.4x10^-9 C. i) calculate the electric potential at a point .10 m from the center of the sphere. ii)calculate the electric potential at a point .24 m from the center of the sphere. The Attempt at a...

I want to use some motors i had laying around to do a project. A flick of the shaft measures 5MA. I want to rewind the motor so it produces 10ma. do I use bigger wire, or the same size wire just more of? less of or will I just have to

I purchased two of these for 14$: What can I make from them? My father suggested making a current transformer but I am wondering what else you think I can use those large copper things for? (I just started my first semester of EE, I like tinkering with electronics in my spare time.)

*Messed up title, should have been find initial temp of copper* Homework Statement 8.00 g of aluminum at 200 °C and 18.0 g of copper are dropped into 50.0 cm3 of ethyl alcohol at 15 °C. The temperature quickly comes to 26.0 °C. What was the initial temperature of the copper? Density of ethyl...

My question is just what the title says. Why is copper tubing used instead of normal wire or enameled wire to make antennas and coils at high frequencies? Does it offer less resistance than normal wire?

Homework Statement 2. A solid copper sphere of radius 15.0 cm carries a charge of 40 nC. Find the electric field (i) 12.0 cm, (ii) 17.0 cm and (iii) 75 cm from the centre of the sphere. (iv) Explain how your answers would change if the sphere were hollow. Homework Equations...

Copper + (KI + I2) = ? Hi all, I have put some copper (60um - electroplated on a gold seed layer of 100nm) in the following solution: KI + I2 The copper is still there, but is now covered by a thick layer of a "grey compound"... Huh I'm really dummy in chemistry... can you help me...

I am running hot air through a copper tube that is inside a chest freezer. I would like to encase the copper tube in a coolant that will help cool the air in the tube and was wondering which of these 2 would work better, water mixed with antifreeze at a temperature of 0 degrees F, or Ice at 0...

Homework Statement A Copper Ring with Radius r and mass m hangs by a thread and rotates with a period T. Ring's coefficient of self inductance is L . What would be a new rotation period of ring, if it was in a horisontal uniform magnetic B field, which is parallel to Ring's plane on a...

Hello All, Greetings. I am new to this forum. I am working for a heater project, in which we use plastic (PA66) over molded on aluminum (6061-T6) body for melting corrosive liquids (similar to sea water). The Aluminum body is heated by means of Positive temperature coefficient material (PTC)...

Homework Statement A long copper rod with insulated lateral surface has its left end maintained at a temperature of 0C and its right end, at x=2m , maintained at 100C . Determine the temperature T as a function of time and coordinate if the initial condition is given by T(x,0)={ 100x, 0<x<1...

Homework Statement Our teacher said that if a material has an odd number of electrons, it implies a paramagnetic behavior. Copper, according to him, has odd number of electrons but is considered a diamagnetic material. He asks us to explain this phenomenon. Homework Equations Copper...

I am looking for copper fins the same as would be on a heating pipe. the fins need to be like a coil or slinky. If you have ever used or know who makes them please let me know. I am working on an invention and this is one of the parts i need. 2 to 3" OD and 3/4 to 1" ID

If I sleep on copper would there be any beneficial release of negative Ions to improve my well being. In addition, will the thermal properties of copper stabilize my body temperature at 37.5c.

Homework Statement A 10-g piece of copper is to be formed into a wire of radius 1.0 mm at a temperature of 50° C. What is the resistance of this wire? (Hint: you will need to look up the density of copper.) If a potential of 12 V is put across this wire, what is the drift velocity...

I was recently asked why the iron in our blood wasn't killing us while iron is poisonous to the body; and what would be if it was other metals than iron in our blood, what would happen?

Is it possible (and practical) to use electromagnetic waves to heat copper (or other metals such as iron, steel or an aluminium alloy) over long distances (such as 1km)?

i read on wikipedia that 2 Cu (s) + H2O (g) + CO2 + O2 → Cu(OH)2 + CuCO3 (s) although doesn't the copper form copper oxide first? and then the copper oxide reacts with water and CO2 to form copper carbonate and copper hydroxide?

Homework Statement So i had to make a thesis and hypothesis for this lab where i have magnets in bundles all of the same mass some with more magnets in them than others. I have to do a lab and an analysis of how it relates to forces and energy and work Homework Equations Does the...

Hi, In class we were discussing the effects of a two bar magnets being dropped through a copper tube at around the same time, with the same pole facing towards each other, so that the two magnets repel - would the magnets fall through the tube faster or slower than if only one was dropped...

According to the reactivity series, copper is below hydrogen. In theory, hydrogen gas should be able to displace copper in a copper(II) chloride solution should the gas be bubbled into the solution, is this true?

I was wondering what the difference in current is if there is one when you have a bundle of copper wire passing through alternating magnetic fields verses a solid copper rod of the same diameter. Will the rod have more current because there is more copper? Would it have less because more copper...

I have a discussion about shielding of noise generated by appliance and florescent lights. I know both Al and Cu are not magnetic material. BUT all noise are time varying meaning it is EM field. Good conductor block E field as loss is very high. How does that work when only the B field can pass...

12-gauge copper wire has a radius of 1.03×10−3 m. (a) What is the resistance of 11.5 m of this wire at 20°C. (b) How much current will pass through the wire if a potential difference of 9.00 V is applied across it? The resistivity for copper is 1.7E-8 ohm meters For part a: The equation is...

I am trying to figure out if you have one pound of copper density 8.95 and if you have a pound of silver density 10.4 how much space each will take or how much more space the copper will take this can be ounce's or whatever metric measurement they use for volume as I put a pound of copper in...

Hey all, I am looking at the American Wire Gauge chart listed on Wiki (http://en.wikipedia.org/wiki/American_wire_gauge"]).[/PLAIN] I am attempting to determine how they are getting their copper resistance values. From my education, DC resistance is equal to...

Homework Statement A slab of copper of thickness b = 1.370 mm is thrust into a parallel-plate capacitor of C = 9.00×10-11 F of gap d = 10.0 mm, as shown in the figure; it is centered exactly halfway between the plates. If a charge q = 1.00×10-6 C is maintained on the plates, what is the...

Homework Statement In my Chemistry lab, we made silver using copper and silver nitrate. We put a solution of silver nitrate, distilled water, and copper wire in a test tube and observed it. Then we took the copper out (the solution turned blue and the copper had crystals formed on it but we...

Copper + NaCl + H20 = >> ? Does anyone have any suggestions on what chemical reaction will occur in above example? Thanks in advance for any suggestions

Homework Statement See figure attached. Homework Equations The Attempt at a Solution See other figure attached. Am I correctly calculating the power that passes through the area given in i) at the surface? I'm not certain my expressions for, \vec{P_{2AV}^{t}} are...

Homework Statement A 200m long copper wire, with cross section area of 1.5mm2, is connected with a 10Ω resistor in a series circuit, and the supply voltage is 50V. Homework Equations Find the power loss in the copper wire, when ρ=0.0175 Ωmm2/m The Attempt at a Solution R=*L/A...

hi guys, m a lil stuck here what voltage would be rquired to heat a 7cm long copper wire of .75mm diameter in about 2-3 seconds.the target temp is 400-450c. dr ankit