Which of the following is NOT true? A permanet magnet:
a) will always be magnitized
b) can be demagnitized by heating
c) can be demagnitized by hammering
d) can be remagnitized by placing it in external magnetic field
I eliminated c),and d) I think the correct answer is a) because magnets arent always magnitized
To determine the correct answer, let's look at each statement and go through the process of elimination.
a) A permanent magnet will always be magnetized.
To check if this statement is true, we need to know if permanent magnets retain their magnetism indefinitely. We can verify this by referring to scientific principles or conducting an experiment. However, it is important to note that permanent magnets can lose their magnetism over time due to various factors like exposure to heat or being subjected to a strong external magnetic field.
b) A permanent magnet can be demagnetized by heating.
To determine the validity of this statement, you can perform a simple experiment. Take a permanent magnet and heat it to a high temperature. If the magnet loses its magnetic properties, then the statement is true. However, if the magnet maintains its magnetism after heating, then this statement is false.
c) A permanent magnet can be demagnetized by hammering.
To evaluate this statement, you can conduct another experiment. Take a permanent magnet and strike it repeatedly with a hammer. If the magnet loses its magnetic properties, then the statement is true. However, if it remains magnetized, then this statement is false.
d) A permanent magnet can be remagnetized by placing it in an external magnetic field.
To test the accuracy of this statement, you can expose a demagnetized permanent magnet to a strong external magnetic field. If the magnet becomes magnetized again, then the statement is true. Otherwise, if the magnet remains demagnetized, then this statement is false.
By eliminating statement c) and d) based on your reasoning, you are left with two options:
a) A permanent magnet will always be magnetized.
b) A permanent magnet can be demagnetized by heating.
To determine the correct answer between these options, you need to re-evaluate statement a) and consider the fact that permanent magnets can lose their magnetization over time. Therefore, the correct answer is:
a) A permanent magnet will always be magnetized.