1) Electric current-carrying wire behaves like a  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo.
2) The unit of magnetic field strength is named the  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo.
3) The ends of the compass needle point approximately towards  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo and  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo directions.
4) The end pointing towards north is called  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo. The other end that points towards south is called  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo.
5) Like poles  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo, while unlike poles of magnets  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo each other.
6) The region surrounding a magnet, in which the force of the magnet can be detected, is said to have a  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo.
7)  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo is a quantity that has both  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo and  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo.
8) It is taken by convention that the field lines emerge from  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo and merge at the  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo.
9) Inside the magnet, the direction of field lines is from its  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo pole to its  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo pole. Thus the magnetic field lines are  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo curves.
10) No two field-lines are found to  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo each other. If they did, it would mean that at the point of intersection, the compass needle would point towards  attractclosedcrossdirectionmagnetmagnetic fieldmagnitudenorthnorth poleOerstedrepelsouthsouth poletwo directions, which is not possible.