Here are the statements sorted into true and false categories:
True:
A. You can change the strength of an ELECTROMAGNET with more or less electrical current.
D. The NORTH POLE of one magnet will ATTRACT the SOUTH POLE of another magnet.
E. The SOUTH POLE of one magnet will REPEL the SOUTH POLE of another magnet.
F. The SOUTH POLE of one magnet will REPEL the NORTH POLE of another magnet.
G. The force of an electromagnet is temporary, meaning the magnetic field only exists while electricity is flowing through the wire.
False:
B. You can change the strength of a BAR MAGNET with more or less electrical current.
C. The NORTH POLE of one magnet will ATTRACT the NORTH POLE of another magnet.
H. The magnetic force of a bar magnet is temporary, meaning the magnetic field goes away.
Explanation:
- A is true because the strength of an electromagnet can be adjusted by varying the electric current.
- B is false as a bar magnet's strength cannot be altered by electrical current since it is a permanent magnet.
- C is false because like poles repel each other; north repels north.
- D is true because opposite poles attract.
- E is true because like poles repel each other; south repels south.
- F is true because opposite poles attract; south repels north.
- G is true as the magnetic field of an electromagnet depends on the flow of electricity.
- H is false; a bar magnet's magnetic field is persistent (it does not go away unless demagnetized).
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