1. The phenomenon due to which an unmagnetized magnetic substance behaves like a magnet due to the mere presence of another magnet (which is not actually in physical contact) is called   magnetic lines of force   magnetic field   magnetic induction   Hint Half-n-half Clue   2. The arrow on a magnetic line of force is determined by the direction in which a free _______ pole would point in a magnetic field.   south   north   3. Magnetic lines of force intersect each other at right angles.   True   False   4. Magnetic lines of force travel from _______ outside the magnet.   south to north   north to south   5. The preservation of the magnetism of magnets can be done by using magnetic _______.   fields   lodestones   keepers   Half-n-half Clue   6. It is possible to make a bar magnet having a north pole at each end and a south pole in the middle.   True   False   7. The earth has been found to behave like a huge magnet.   True   False