Magnetic force Definition and 398 Threads

If I have one magnet sitting on a table and I take another magnet and bring close to the first one it will move towards the magnet! This is amazing to me. My question is why does one magnet make another move toward or away from it? what is the origin of magnetic force. I think it has...

The two conducting rails in the drawing are tilted upwards so they make an angle of 30.0° with respect to the ground. The vertical magnetic field has a magnitude of 0.055 T. The 0.22 kg aluminum rod (length = 1.6 m) slides without friction down the rails at a constant velocity. How much current...

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In a television set, electrons are accelerated from rest through a potential difference of 25 kV. The electrons then pass through a 0.26 T magnetic field that deflects them to the appropriate spot on the screen. Find the magnitude of the maximum magnetic force that an electron can experience...

As we know for over 100 years magnetic force in an relativistic effect caused by the movement of charged particles. Let’s take the standard example - current in a wire. If a charged test particle (say electron) is moving relative to the wire it feels the Lorentz force. I can understand...

Hello guys I have the following problem : At a certain location, Earth has a magnetic field of 8.4 X 10^-5 T pointing 40 degree below the horizontal in a north-south plane. A 14.1m long straight wire carries a(n) 7 A current. If the current is directed horizontally toward the east, what...

In a television set, electrons are accelerated from rest through a potential difference of 19 kV. The electrons then pass through a 0.29 T magnetic field that deflects them to the appropriate spot on the screen. Find the magnitude of the maximum magnetic force that an electron can experience...

A current of 3.1 A flows in a straight wire segment length (4 cm)i + (5 cm)j in a uniform magnetic field of strength (0.9 T) i. Find the magnitude of the force on the wire. Answer in units of N. First I found the magnitude of the length of the wire, \sqrt .04^2 +.05^2 = .0640 m. Then I...

A metal ball having net charge 8.9e-6 C is thrown out of a window horizontally at a speed 47 m/s. The window is at a height 89 m above the ground. A uniform horizontal magnetic field of magnitude 0.03 T is perpendicular to the plane of the ball's trajectory. Find the magnitude of the magnetic...

I have a question here A rectangular plane loop with dimensions 250 mm by 180 mm is pivoted to rotate about the z axis. The long side of the loop is along the y-axis and the plane of the loop makes an angle of 45 degrees with the y-axis. If a uniform magnetic field of magnitude 300 mT is in...

How can I Compare the magnitudes near the earth’s surface of the weight of an electron and a typical magnetic force exerted by the earth’s magnetic field (B = 10-5T) on an electron with speed 10 m/s. As I understood Weight of electron = mg Magnetic force=qBv am I right?

I've been having some trouble with this homework problem: There is a semicircular current loop that lies in the xy plane. The straight segment "a" of of the loop has length 2R while the semicircular segment "b" has radius R. There is a magnetic field of strength B into the page. Current I is...

As I understand it, a current flowing through a conducting strip in a magnetic field perpendicular to the current will drift to the side creating an electric field that corrects the currents motion and creates a potential difference across the conductor. Why then does a current carrying wire in...

I'm not sure if this belongs here or in the relativity forum but associated with an electromagnetic wave is a magnetic field B and the force of this field on a charge q with velocity v is qv x B. Since any charge will be moving with speed c relative to the wave, will the magnetic force on a...

hey physics experts could you help me out with these two problems please? 1/ A positively charged particle of mass 5 x 10^-5 kg is traveling due east with a speed of 80 m/s and enters 0.3 T uniform magnetic field. The particle moves through one quarter of a circle in a time of 2 x 10^-2s, at...

Hello everyone, I think I am missing this problem because there is an angle invovled, but it doesn't seem to matter what angle it is from what my lecture notes say. but here's the question: The bent wire shown in Fig. 28-39 lies in a uniform magnetic field. Each straight section is 2.1 long and...

When a charged particle moves at an angle of 19° with respect to a magnetic field, it experiences a magnetic force of magnitude F. At what angle (less than 90°) with respect to this field will this particle, moving at the same speed, experience a magnetic force of magnitude 1.8F? can...

Question: What is the radius of the smallest possible circular orbit that a 2MeV proton can have in a 2 T magnetic field? Answer (what I've got so far, at least): I assume that r = mv/qB is the formula I use for this problem, due to being given mass, B, q and all that, but I can't...

Am I correct in assuming that if the distance between two poles of different magnets is halved, then the force of repulsion (or attraction) will increase while the attraction (or repulsion) will decrease? If the distance is halved, isn't the force quadrupled? Thanks.

why is the magnitude of velocity of a charged particle not affected by magnetic force? :bugeye:

I have a problem with a question that asked me to give the direction of magnetic force of a long wire with a current flowing from west to east horizontally with a magneitc field pointing into the page. What is the direction of the force and the motion afterwards?

Hi everyone, I am trying to learn about electromagnets for a project I am working on and I need to know how much magnetic force (in Teslas) that I would need to lift a given weight. Would anyone be able to point out a formula that I would be able to use? Any help would be greatly...

Could anyone please help me with the following problem? [FONT=Courier New]A compact package contains n = 100 long straight wires, shaped like a cylinder with a radius of R = 0.500 cm. If each wire conducts i = 2.00 A, calculate the intensity and direction of the magnetic force per unit of...

Hi, I am having trouble with my last physics homework question (below): When a charged particle moves at an angle of 16° with respect to a magnetic field, it experiences a magnetic force of magnitude F. At what angle (less than 90°) with respect to this field will this particle, moving at the...

Hello. I am currently working on this problem: "An electron moves in the X-Y plane with a velocity v = (5 *10^5 m/s , 30 degrees). The uniform magnetic field i the region is B= ( 6 i - 2 j + 1 k ). Find the resultant magnetic force on the electron in component form." I know that F = qv...

A proton of mass 1.7 x 10^-27 kg and spped 3 x 10^7 meters per second is moving in a circle of a radius of 200 meters. What formula do I need to use to find out the best estimate of the order of magnitude of the magnetic force needed to maintain this motion?

I'm stuck on the following problem: A long thin coil of length l, cross-sectional area S, and n turns per unit length carries a current I. It is placed along the axis of a large circular ring of radius a, which is carrying a current I'. If d is the displacement of the center of the coil from...

Hi. Ok, here's the problem: An electron that has velocity v = (3.6 106 m/s) i + (3.7 106 m/s) j moves through a magnetic field B = (0.03 T) i - (0.15 T) j. (a) Find the force on the electron. I know how to find the force from scalar numbers (using the equation F_mag = q x v x...

I am a chemistry student that is trying to calculate the magnetic force on a cylinder due to a gradient produced by sitting in an annulus. The annlus is a cylinder of height h with outer radius ro and inner radius ri. The other cylinder has height h and radius r such that a gap exists with...

Hi, I have a question: If there is a negative charge moving w/a velocity that is 50 degrees counter-clockwise from the +x-axis and a B field in the +z direction, I get that the magnitude of the Magnetic Force=(abs. val of q)(abs. val of v)(abs. val of B)sin(theta), where theta=angle b/t v and B...

The x, y, and z components of a magnetic field are Bx=0.193 T, By=0.233 T, and Bz=0.263 T. A 29.5 cm wire is oriented along the z axis and carries a current of 4.01 A. What is the magnitude of the magnetic force that acts on this wire? how do i calc my B cuz i know f=4.01A/(0.295m)(?T)(sin90)

Ok, an ion experiences a magnetic force of 6.2X10^-16 N when moving in the positive x direction, but no force when moving in the positive y direction. What is the magnitude of magnetic force exerted on the ion when it moves in the x-y plane along the line x=y? Assume the ions speed is the same...

1)A beam of electrona travels along an evacuated tube towards a floriscent screen.A coil is placed around the tube producing magnetic field along the axis of the tube. a)describe and explain the motion of the beam if: 1)it is exactly parallel to the axis of the tube My working: I think...

how do you find the direction of the magnetic force on a current loop..a loop that experiences a torque? i know you use some kind of right hand rule but I am confused also..the direction of a charged particle in a magnetic field please helpppppp

Magnetism: Magnetic field between wires Two long parallel wires are a distance of d = 1 cm apart and carry equal antiparallel currents of 8 Amperes. Find the magnetic field intensity (in T) at the point P which is equidistant from the wires. (R = 10 cm). This should be easy but I haven't...

magnetic forces on a conductor A straight, vertical wire carries a current of 1.13A downward in a region between the poles of a large superconducting electromagnet, where the magnetic field has a magnitude of 0.553T and is horizontal. What is the magnitude of the magnetic force on a section...

ok here's my problem(s)... I think the first one I'm missing something... it says: A particle initially moving south in a vertically downward magnetic field is deflected toward the east. What is the sign of the charge on the particle? Explain your answer with a diagram. So the way I...

here is the problem: prove that the vector of the magnetic force cannot be parallel to the plane that contains the vector of the particle's velocity and magnetic field. someone please help me to solve this, thanks so much for your time.

ok I'm stuck here... At a particular point in time, an electron is moving with a velocity of v=(2.0*10^6 m/s)i + (3.0*10^6 m/s)j in a constant magnetic field with strength e=(0.030T)i - (0.15T)j What is the magnitude of the magnetic force on the electron at that moment? this i found...

Find I2 so that the magnetic force per unit length on each wire is zero. The three parallel wires are equally spaced. Current directions are shown with '<' or '>'. I1 = I3 = 1 A < I1 < I1 < I1 --------------- > I2 > I2 > I2 --------------- < I3 < I3 < I3 --------------- I have...

Magnetism and magnetic force are typically explained by the resultant effect on moving charges. Is anyone aware of any reseach, studies or literature that quantifies the interactive forces between two or more magnetic objects without utilizing the effect on moving charges to explain interactive...

A Fe+ ion is traveling at 200 m/sec in a direction 20 deg south of west at a point. The magnetic field at that point is 0.4 T directed at 10 deg west of south. What is the instantaneous magnetic force that acts on the Fe is how many Newtons?

it is often said that "magnetic forces can do no work".. but a straight wire segment placed in a magnetic field experiences a force of mag. B*I*L (LaPlace' law) which accelerates it and thus does work.. how can this be true?? is it really an electric force that is doing the work here or what?

A segment of wire carries a current of 30 A along the x-axis from x=-6m to x=0 and then along the z axis from z=0 to z=5.5m. In this region of space, the magnetic field is equal to 14mT in the positive z direction. What is the magnitude F of the force on the segment of wire? Answer in units of...

Three parallel wires each carry current I in the direction shown in the figure (file attached). If the separation between adjacent wires is d, calculate the magnitude and direction of the net magnetic force per unit length on each wire. a) What is the magnetic force on the top wire? I think...

Three parallel wires each carry current I in the direction shown in the figure (file attached). If the separation between adjacent wires is d, calculate the magnitude and direction of the net magnetic force per unit length on each wire. a) What is the magnetic force on the top wire? I think...

I'm stuck on this problem. I think it's the 3D geometry that's giving me the biggest problem. The current i exists in the direction shown (from left to right) in a parabolic wire segment whose equation is y = (x^2)/b in the XY plane between x = -a and x = +a. Magnetic flux density, given by...

I got sucked into the page on a website about magnets. It got into stuff about magnetic force on a moving charge. It said that the force on the charge is perpendicular to the magnetic field and the velocity of the charge. I got very confused because it called this force the "magnetic force" and...