This entity has units of either (*) gausses or teslas, and is denoted capital B. Rotating examples of these form alternating current, while their formation from electric currents drive generators.
This entity is equal to the curl of the vector potential. The divergence of this entity is zero, while the enclosed current is proportional to a closed loop around this entity according to Ampere's Law, which can be used to show that its strength is increased inside the loops of solenoids. This entity has units of either (*) gausses or teslas, and is denoted capital B. Rotating examples of these form alternating current, while their formation from electric currents drive generators. Iron fillings can be used to show, for 10 points, the lines denoting what entity associated with north and south poles?
This entity is equal to the curl of the vector potential. The divergence of this entity is zero, while the enclosed current is proportional to a closed loop around this entity according to Ampere's Law, which can be used to show that its strength is increased inside the loops of solenoids.
 magnetic field (or B-field; do not accept or prompt on simply "magnetism")