How does the diameter of the coil loop affect the magnetic field?
The magnetic field inside a solenoid does not depend directly on the diameter of the wire. It is proportional to the number of turns of the wire, and also proportional to the current in the wire. Obviously, the number of turns of wire that will fit around the solenoid does depend on the diameter of the wire.
How does the length of the coil affect the strength of the magnetic field?
The amount of magnetic field generated by the wire can be calculated if you know the length of wire and current. You can add more coils on top of the first row, and this just adds more field strength. In technical terms, every coil of wire increases the “magnetic flux density” (strength) of your magnet.
Does diameter affect magnetic field?
The magnetic field inside a solenoid is proportional to both the applied current and the number of turns per unit length. There is no dependence on the diameter of the solenoid, and the field strength doesn’t depend on the position inside the solenoid, i.e., the field inside is constant.
What is the magnetic field of coil?
To increase the magnetic field, you can either use more turns per unit length or increase the current. We have found that the magnetic field is uniform inside the coil; that is, the magnetic field along the axis is equal to the magnetic field close to the cylinder wall formed by the coil.
Does coiling wire increase resistance?
If you coil a wire its resistance does not change. As that is purely down to the material that the wire is made out of and the diameter, temperature coefficient and the length of the wire. Coiling the wire will however will change the inductance of the wire.
What happened if you coil up a lot of wire?
The more loops the coil has, the stronger the magnetic field, while the current is flowing. But when you coil the wire around an iron nail, the magnetic domains inside the nail line up and make a strong, temporary magnet. If you disconnect the wire, the magnetic field disappears and the nail is no longer a magnet.
Are coiling cables bad?
Why “Straight Coiling” Mic Cables is Bad This isn’t just frustrating. Constantly twisting a multi-strand cable in the same direction puts strain on the wires inside, as the outermost wires have to travel further than the inner wires. Over time, this will cause the wires to break prematurely.
Do bends in wire affect resistance?
Free electrons in a wire have small value of drift velocity and hence low value of inertia of motion. Due to it, they are able to go around the bends easily. That is why, the electrical resistance is not affected on bending the wire till the area of cross-section remains the same at the bend.
How does twisting wire affect resistance?
When you twist you shorten the two wires, since they’re going around each other instead of straight. Parallel will give you lower resistance per wrap (given equal ID) than twisted. And twisted gives you more surface area.
Does the shape of the copper wire change when bent?
Copper wire or tubing is quite soft in its initial state, allowing for a variety of uses where the tubing needs to be bent to a desired shape. Upon bending, the copper hardens due to work hardening (also called strain hardening). Enough bending will make it impossible to return it to its original shape.
Why does resistance increase with temperature?
Heating a metal conductor makes it more difficult for electricity to flow through it. These collisions cause resistance and generate heat. Heating the metal conductor causes atoms to vibrate more, which in turn makes it more difficult for the electrons to flow, increasing resistance.
Why is resistance directly proportional to temperature?
Resistance of a conductor is directly proportional to temperature. With the increase in temperature, vibrational motion of the atoms of conductor increases. Due to increase in vibration, probability of collision between atoms and electrons increases. As a result, resistance of conductor increases.
Does GE’s resistivity increase or decrease with temperature?
Metals have positive thermal coefficient of resistance while semiconductors have negative thermal coefficient of resistance. And when Ge(semiconductor) is cooled its resistance will increase with decrease in temperature.
Does resistivity depend on length and area?
The resistivity of a material is the resistance of a wire of that material of unit length and unit cross-sectional area. The resistivity of a material depends on its nature and the temperature of the conductor, but not on its shape and size.