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magfields

# magfields - Note-A-Rific Magnetic Fields We can imagine a...

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Note-A-Rific: Magnetic Fields We can imagine a magnetic field surrounding a magnet. The force one magnet exerts on another is the interaction between one magnetic field and another magnetic field. This is why we can have forces without the objects touching, just like the force due to gravity and the force between charges. To draw magnetic field lines… 1. The direction of the magnetic field is tangent to the line at any point 2. The field lines point in the direction a north pole of a magnet would point (so, from north to south). 3. The number of lines per unit area is proportional to the magnitude of the magnetic field (lines closer together means stronger magnetic field). We can define the magnetic field at any point as a vector, represented by the symbol B . The direction of the vector is defined as above (from north to south). The magnitude is defined in terms of the torque (“twisting force”) exerted on a compass needle when it makes a certain angle with the magnetic field. We will use this vague definition for now, but a more precise definition will

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magfields - Note-A-Rific Magnetic Fields We can imagine a...

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