Question

why magnetic lines of forces makes a closed loop

Answer 1

they can make closed loops which looks weird but if u think about it ull find that the work done by the field is zero even on a closed loop. thats why closed loops of magnetic fields do not contradict their conservative nature.

Answer 2

Keep watching and you'll see that one of the Maxwell equations deals with this very question.

Answer 3

Because magnetic field are like electric dipoloes. You cannot have monople, north and south come always togheter. So the lines that start from north always end in south in the same piece. Hope I help you!

Answer 4

magnet has dipole(one north & other south)property.no matter how many pieces u make of a magnetic material two poles always exists.magnetic lines of force always start from north pole and end at the south.these lines of force exist all around the magnetic dipole from north to south,every lines of force originate at single point of north pole & end at single point of south pole3 dimensionally.this results in formation of closed loop of magnetic lines of forces all around the magnet.refer the attached image for aid.

Answer 5

the most simple and obvious reason is that magnetic uni-poles can't exist, therefore the magnetic field lines originating from one of the pole will and should end up on its companion pole

Answer 6

Magnetic fields are also generated when electricity flows through a wire - the field lines are circular. Bottom line, a magnetic field is sourceless, thus the lines do not have a beginning.

Answer 7

I'm not crazy about the language that a magnetic field is "sourceless"; it makes it almost sound as though it arises without a cause.

Anyway, as I originally suggested, this is discussed beginning chapter 11.