This is commonly used to increase the strength of a magnetic field. The more turns of wire on the coil, the stronger the magnetic field will be. The magnetic fields generated by the separate turns of wire will all pass through the center of the coil producing a strong magnetic field.
Full Answer
What is the effect of current on magnetic field of circular coil?
(i) If the value of current increases, the magnetic field produced in a current carrying circular coil will also increase. (ii) The magnetic field decreases if the distance from the coil increases. (iii) Magnetic field increases if there is increase in the number of turns of coil. Please log in or register to add a comment.
Why does the number of turns in a coil increase magnetism?
In most cases R2 is a small fraction of Rt, so doubling the number of turns (and subsquently R2) will not half the current, and so magnetism increases. Show activity on this post. Because of magnetic field attraction towards the coil.
How does the strength of the magnetic field depend on radius?
How does the strength of the Magnetic field at the centre of a circular coil of a wire depend on: (a) radius of the coil (b) number of turns in the coil. (a) More the radius weaker the field. (b) Field strength is directly proportional to the number of turns in the coil. Was this answer helpful?
How do you find the magnetic field on a circular coil?
Magnetic Field on the Axis of a Circular Coil Consider a circular loop of radius a through which current I is flowing as shown in fig. The point P lies on the axis of the circular current loop i.e., along the line perpendicular to the plane of the loop and passing through its center.
How does the number of turns in a coil affect the magnetic field?
The strength of the magnetic field increases as: The number of turns in the coil increases. An iron core makes a strong electromagnet which can be easily magnetised and demagnetised.
What happens if more turns are added to the coil of an electromagnet?
Lines of Force around an Electromagnet The magnetic field strength of an electromagnet is therefore determined by the ampere turns of the coil with the more turns of wire in the coil the greater will be the strength of the magnetic field.
How do you increase the magnetic field around a circular coil?
SolutionBy increasing the current passing through the coil.By decreasing the radius of the coil.By increasing the number of turns of wire in the coil.
Why does magnetic field increase with number of turns?
They have some other resistive elements that are not part of the coil. Then the equation looks like Rt=R1 + R2, where R2=rho(L)/A. In most cases R2 is a small fraction of Rt, so doubling the number of turns (and subsquently R2) will not half the current, and so magnetism increases.
Why does the number of turns affect the strength of an electromagnet?
Increasing the number of coils, which adds more field lines and makes the electromagnet stronger.
What happens when number of turns increases?
Increasing the number of turns will increase the magnetic field.
Does the magnetic field depend on the number of turns in a circular coil?
(b) Field strength is directly proportional to the number of turns in the coil.
How can we increase the strength of the magnetic field in a coil?
There are two methods by which we can increase strength of magnetic field are: 1) By increasing the number of turns of wire in the coil. 2) By increasing the current flowing the coil. Q. (d) decreasing the number of turns of coil.
How can we increase the strength of magnetic field?
The strength of the magnetic field around a solenoid can be increased by:increasing the number of turns on the coil.increasing the current.placing an iron core inside the solenoid.
What will happen to the magnetic field when the number of turns in a coil is doubled?
Solution : The magnetic field reduced by a current carrying wire at a given point depends directly on the current passing through it, If the number of turns in the circular coil is double, the field produced will also get double as that produced by a single turn.
When we increase the number of turns of a electromagnet the magnetic strength will?
Increasing the number of turns in the coils, the greater the number of turns, the greater the strength; Whether the core is made up of a soft or hard magnetic material. Soft iron will magnetize more readily than steel.
What would happen if the coil was rotated faster?
The faster the coil rotates the faster will it cut the magnetic field and the bigger will be the output voltage. Figure 1 shows a coil with only one turn, in a real generator there would be lots of turns.
How can you increase the strength of an electromagnet?
The strength of an electromagnet can be increased by increasing the number of loops of wire around the iron core and by increasing the current or voltage.
How can you make an electromagnet stronger?
You can make an electromagnet stronger by doing these things:wrapping the coil around a piece of iron (such as an iron nail)adding more turns to the coil.increasing the current flowing through the coil.
How can you increase the resistance of an electromagnet?
If you add the turns to the middle, then you make the field stronger there. Adding more turns in the coil can also increase the total resistance of the wire. If you're powering the magnet with a constant voltage source (like a battery), the current will be inversely proportional to the resistance in the wire.
Where is the point P in a circular current loop?
Consider a circular loop of radius a through which current I is flowing as shown in fig. The point P lies on the axis of the circular current loop i.e., along the line perpendicular to the plane of the loop and passing through its center .
What is the dipole moment of a current loop?
The magnetic dipole moment of the current loop. The current loop can be regarded as a magnetic dipole that produces its magnetic field and the magnetic dipole moment of the current loop is equal to the product of ampere-turns and area of the current loop. we can write.
Quantitative Discussion
First of all let's derive the expression for the magnetic field at the axis of a current carrying coil
Qualitative Discussion
For a coil of n turns we can apply the formula B = μ 0 N I 2 R only when all the N turns of the coil are nearly on the same cross section. Otherwise we will have to resort to the expression of solenoid.
Practice Problem
1. A circular coil of wire has 100 turns of radius 12 cm, and carries a current of 1 A in a clockwise direction when viewed from the right side. Find the magnitude and direction of the magnetic field:
State right-hand thumb rule
The right-hand thumb rule states that “Curl the palm of your right hand around the circular wire with the fingers pointing in the direction of the current. The right-hand thumb gives the direction of the magnetic field”.
What is electromagnetic force?
It is one of the fundamental forces that deals with the physical interaction between electrically charged particles. The electromagnetic force acts between charged particles and is the combination of all magnetic and electrical forces.