# Physics magnetic field and direction

And that kind of makes sense if you imagine the magnetic field spreading out. As shown in [link]the direction of magnetic field lines is defined to be the direction in which the north end of a compass needle points. So let's see. The SI unit for magnitude of the magnetic field strength is called the tesla Twhich is equivalent to one Newton per ampere-meter.

This is confirmed by the cross product. You'll just have to know that this is the shape if the current is going in that direction.

## Magnetic field due to current carrying wire

But it actually turns out that your calculator has that value. What's r? The magnetic force on a moving charge is one of the most fundamental known. The magnitude of the force is determined from the definition of the cross product as it relates to the magnitudes of each of the vectors. You could imagine if, on this drawing up here, you could say this is where it intersects the screen. Even though there are no such things as isolated magnetic charges, we can still define the attraction and repulsion of magnets as based on a field. So what you do is you go to second and you press constant, which is the 4 button. So it's always in the back of your mind. Both the fields for a coil of wire and a solenoid can be constructed from this equation. It's going to be teslas. The magnitude of this force is proportional to the amount of charge q, the speed of the charged particle v, and the magnitude of the applied magnetic field. The last property is related to the fact that the north and south poles cannot be separated. Defining the Magnetic Field A magnetic field is defined by the force that a charged particle experiences moving in this field, after we account for the gravitational and any additional electric forces possible on the charge. Provided by: Boundless.

Hopefully that makes sense. We're saying that these moving charges, not only can they be affected by a magnetic field, not only can a current be affected by a magnetic field or just a moving charge, it actually creates them.

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