JAMB - Physics (1984 - No. 44)
A short bar magnet is placed in earth's magnetic field, as shown above, which of the points II and III are/is possible positions of a neutral point?
I only
II only
III only
I and II
I,II and III
Giải thích
When the magnet is placed with its north pole pointing toward the earth's magnetic north, the two neutral points will occur at III, according to the diagram above.