Magnetic force Definition and 398 Threads

Let's say I have a magnetic ball within a solenoid that has current passing through it. How would I calculate the magnetic force on the ball?

Can you explain me this: Ferromagnet has permanent magnetic force and can't lose it in the constant conditions, so if i put magnet and piece of the metal it will be pulled away from the magnet creating some kinetic energy. As energy can't be created, just transfered, so I don't understand who...

Our professor proposed a scenario during lecture that went like this, There is a wire of infinite length that has a current. At a short distance from the wire is a single charge which is stationary relative to the wire. What i don't understand is this, since the charge has a velocity relative...

Homework Statement (Ans: A,B,C,D) Homework Equations The Attempt at a Solution The magnitude of force on the structure is given by $$|I(\vec{AC}\times \vec{B})|=I|\vec{AC}||\vec{B}|\sin(\pi/4)$$ From the question, ##I=2\,A##, ##|\vec{AC}|=2\sqrt{2}\,m## and ##|\vec{B}|=2\,T##. Hence...

Looking for a way to increase magnetic forces in electrical devices, an option is reduce the air gap, but some times it is not a practicable solution. The question is what happened if we put a ferrofluid between the magnets? Imagine the following situation: a closed volume composed by a...

A magnetic field of 0.0200 T (up) is created in a region a)find initial magnetic force on an electron initially moving at 5.00x10^6 m/s (N) in the field b) what is the radius of the circular path Equations used: a) F=qvB b) F= kq/r^2 Thanks in advance

Homework Statement Me and my physics II lab partner did a term project where we are looking to calculate the repulsive forces of two bar magnets on each other. We are lacking an equation that would let us calculate the force. All we did was have one magnet sit on a flat surface while we...

Homework Statement PHYSICS MAGNETIC FIELD two long parallel straight wire are separated by a distance r in vacuum. an electric current flow through each wire in opposite direction, the magnetic flux density at the centre between 2 wires is (2)(ε0)/(πr) (ANS FROM BOOK) ... can someone explain...

Hello everyone, Translation of extended objects is described taking the net force acting on the center of mass of the extended object. But to compute rotational motion, one needs to considers each force on their point of action. For example, let's consider a current I flowing in a...

Homework Statement Suppose that the magnetic eld in some region has the form B = kzx(hat). (where k is a constant). Find the force on a square loop (side a), lying in the yz plane and centered at the origin, if it carries a current I, flowing counterclockwise, when you look down the x axis...

Homework Statement Just a quick question I had about finding the direction of a magnetic force. I have abandoned my 2D way of thinking when it comes to these because perceptually it's completely wrong to think about it that way. Lets say I have an electron moving with a constant velocity...

I am not able to understand reaction of magnetic force and how it is equal to qvb ?

I've read a lot and watched a lot about lenz's law , about how a magnet moving towards a solenoid will experience an opposing force. But I tried to search how to calculate this force , found nothing . So i tried to find how to calculate force between 2 magnets . Found on wikipedia how to...

Homework Statement Assuming the following directions of the charged particles velocity and magnetic field indicate the direction of the magnetic force exerted on the particle? Homework Equations The Attempt at a Solution The force vector is perpendicular to the B field and the...

When a conductor carries current, due to Lorentz force, the conductor experiences a force. However I was wondering what causes electromagnetic induction. Moving a conductor in a magnetic field causes its charges to experience a Lorentz force, but unlike the case of the current, here both the...

Two long parallel wires carrying current I attract each other. Let's say we let them free to move then they will accelerate towards each other, thereby increasing the kinetic energy of the wires. But we know that magnetic forces can't do work on a system. Then how can magnetic force increase...

A charged particle in a magnetic field experiences a magnetic force that is perpendicular to it. But is that the case with magnetic dipoles? There was this section in my textbook describing Torque on a Bar magnet in a uniform magnetic field which states that the magnetic force m.B on one pole...

Hi I have always been very curious if anybody knows why the magnetic force on a moving charged particle in a magnetic field is always perpendicular to the plane containing the magnetic field's vector and the charged particles velocity vector. Any help would be greatly appreciated. Thanks...

Homework Statement A wire 42.1 cm long carries a 0.660 A current in the positive direction of an x-axis through a magnetic field with an x component of zero, a y component of 0.000330 T, and a z component of 0.00840 T. Find the (a) x, (b) y, and (c) z components of the magnetic force on the...

Homework Statement Find the total magnetic force on the semi-circular part of the conductor. There is a current I running counterclockwise through the semi-circle. The magnetic field B is out of the page.Homework Equations F = Il x B l = Rθ dl = RdθThe Attempt at a Solution I assumed that the...

Hello, I was taught that moving charges in an external magnetic field experience force. Okay. I wondered that if the observer was moving with the same velocity as the charge is what would happen? I studied in one book about field transformation and came to know that the charge will...

there is something I don't understand maybe someone can tell me - a charge q has velocity v along the x axis - there is a uniform magnetic field B along the y axis - so the particule experience a force F=qvB along the z axis Now consider the same situation in a reference frame moving at...

Homework Statement So I'm working through textbook problems in preparation for my physics final, and I just can't seem to get the answers to this question (I'm 99.9% certain I got it wrong as my friends got a different value, but I don't actually know the answer as it's not in the back of the...

Homework Statement a proton moves with a velocity <6*105,3*105> m/s through a magnetic field given by <.2,.2> T a. Find the magnetic force per unit charge on the proton b. Find the work done by this forceHomework Equations Fm=qv x BThe Attempt at a Solution For part a, I used a property of...

I am revisiting a topic discussed in earlier threads, because I feel the answers given there are either incomprehensible or mistaken (or both). It is well known that the force generated by a magnetic field acting on a moving charged particle is perpendicular to the particle's motion, and...

Hello, I know about the right hand rule, but I get confused when velocity and magnetic field are not perpendicular to each other, then how do I determine the direction of the magnetic force? Can I not use the right hand rule?

Hi! When calculating the attraction/repulsion force generated by a magnetic field should I consider the flux density of both and add them to the calculation? By increasing that vector would it increase the total force generated or it has no relevance at all?

Homework Statement Find the force on 7.0 cm of conductor bearing a current of 6A if it lies perpendicular to a magnetic field of intensity 1.2 T and the wire makes an angle of 60° with the magnetic field? Homework Equations F = IlB sin θ The Attempt at a Solution The magnetic force...

Homework Statement A wire having a mass per unit length of 0.560 g/cm carries a 1.90-A current horizontally to the south. (a) What is the direction of the minimum magnetic field needed to lift this wire vertically upward? (b) What is the magnitude of the minimum magnetic field needed to lift...

Homework Statement Lightning strikes a lightning rod that is a thin, hollow cylinder with a radius of 1.0 cm with a peak current of 250 kA. What is the magnetic force on an infinitesimal segment (vertical line) of current of width dx and length L? [3] Homework Equations F =...

Lets say you have a block of iron with a mass "m" exposed to an infinitely strong magnetic field "B." If there was a strong wooden interface preventing this iron block from moving towards the magnetic field source, how can you calculate the force the iron block would exert on the wooden board?

Ok, so. The formula is F=qv x B, meaning that the force vector is an orthogonal vector equal to the cross product of vectors qv and B. There are, however, 2 orthogonal vectors, in each direction. The thing I am having trouble understanding is why is one direction chosen over the other. I...

Homework Statement Find the final velocity of a 5g steel ball bearing being pulled by a neodymium magnet with a pull force of 6.1 pounds (27.1 Newtons) in a straight line on a frictionless surface after being pulled for .1 meters Homework Equations F=MA The Attempt at a Solution f=ma...

Homework Statement A particle of charge −q is moving with a velocity \vec{v}. It then enters midway between two plates where there exists a uniform magnetic field pointing into the page, as shown in attached image. (b) Compute the distance between the left end of the plate and where the...

Hi, I would like to know if it is possible to move a steel wire against frictional forces using a magnet. What would be the approach of calculating the force acting on that thin wire. I would know the dimensions of the wire and the dimensions of the magnet. What other values should I find...

Homework Statement A wire of length L is placed in a magnetic field B,If the current in the wire is I,then maximum magnetic force on the wire is? Homework Equations The Attempt at a Solution Honestly,I have no idea how to do this..(Im in class 9)

Homework Statement Two wires, each having a weight per unit length of 10–4 N/m, are strung parallel, one 0.3 m above the other. If the wires carry the current of same magnitude, how great must the current in each wire be for the magnetic field due to the lower conductor to balance the weight...

Homework Statement A) Which of these materials will feel a force from a permanent magnet - wood, aluminum or steel? B) Will the materials that are attracted by the magnet be attracted to the north pole of the magnet, the south pole, or both? Homework Equations The Attempt at a...

if you have a magnet that pulls 40lbs of force if you broke that into 2 how much force will each magnet pull. i have some neodymium magnets from hardrives and i want to break them up but i want to know if that's gunna make them lose a lot of force. anyone know the formula for calculating...

Hi, I am trying to play around with magnets on my free time, I ordered some neodyum magnets and I've been thinking of making my own electromagnets, I had some of questions and I was hoping someone here mmight help me: 1. About magnetic force: AFAIK magnetic force is perpendicula to the...

Homework Statement Homework Equations The Attempt at a Solution I know that since the charge is negative qo*Vperpendicular would be traveling in the oppsite direction. Which by the right hand rule ultimately affects B. So using the formula F=q0V(perpendicular)*B...

Since the magnetic force between dipoles goes as 1/r^4 and the electrical force goes as 1/r^2 for charges, would electrons be able to theoretically get close enough for their magnetic attraction to be greater than their electrical repulsion? If so, what then?

Does anyone have a good theory for magnetic force? No need to talk about domain alignment or electron spin, (although if you have something deeper then just electron spin, id love to hear it)this much is known. I'm talking about the actual FORCE of magnetism. As in: If you are in a vacuum...

Hi, So, applying the left hand rule I got a force into the page for the question attached. The markscheme, however, claims it is out of the paper. Can anyone help me understand why? Thanks!

Homework Statement Which wire will experience the biggest force? a. 1 b. 2 c. 3 d. all wires experience the same force e. can't be determined without additional information Homework Equations F = BIL sin θ The Attempt at a Solution Can the above formula be applied to a...

This question has been bothering me and i haven't been able to find a satisfactory answer anywhere. A moving charged particle in a magnetic field experiences a force that is perpendicular to both the velocity of the particle and the direction of the magnetic field. My question is why is there...

Noob, apologies to all. What is magnetic force? I can calculate it, and know that it is perpendicular to the motion of an electric force, but what is it? Just because I can calculate it does not mean that I know what I am calculating. Thanks

A rectangular loop of wire measures 1.0 m by 1.0 cm. If a 7.0-A current flows through the wire, what is the magnitude of the magnetic force on the centermost 1.0-cm segment of the 1.0-m side of the loop? Fm = ILBsin of angle Fm = Magnetic force I= Electric current L= Length of...

Homework Statement As shown in the attached figure, two rails of conducting wire,M and N, run parallel to each other on a horizontal plane and are separated by distance l. The rails are in a magnetic field of magnetic flux density B that is in the vertically upward direction. An electrically...

So, I have an apparent paradox: Consider a particle moving with constant velocity, v, along the x-axis. It now enters a constant magnetic field with is parallel to the y-axis. So there is a force, F=q(vxB) which acts on it, and points in the positive z-direction at first, but then as the...