Part (a)Which of the following statements about magnetic fields are true?

There are no magnetic field lines unless iron filings are present.

Magnetic field lines point outward from the south pole of a magnet.

There are no magnetic field lines outside the magnet.

None of these.

Magnetic field lines point in towards the north pole of a magnet.

Magnetic field lines point outward from the north pole of a magnet.

33%Part (b)What is an acceptable ending to the following sentence: "Magnetic field lines..."

All of the above.	Originate from monopoles.
Can cross each other.	None of these.
Are not present without iron filings.	Form closed loops.

part (c)Which of the following arrangements produces an attractive force?

None of these.

North Pole to North Pole.

All of these.

Magnets never attract each other, only iron filings.

South Pole to South Pole.

South Pole to North Pole.