Use ampere’s law to find the magnetic field (a) inside and (b) outside of a long straight cylinder of current with current density j and radius r. remember that j = i/a. when indicating the direction, describe it as clockwise or counterclockwise when looking at the wire with the current going away from you.

explanation: magnetic pole, region at each end of a magnet where the external magnetic field is strongest. the south-seeking pole, or any pole similar to it, is called a south magnetic pole. unlike poles of different magnets attract each other; like poles repel each other.

the area between the graph and the t axis

it's a b and