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In which of the following a permanent magnet not used?
- a)Loudspeakers
- b)In magnetic door catches
- c)In compasses
- d)None of these
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
In which of the following a permanent magnet not used?a)Loudspeakersb)...
Permanent Magnet
A permanent magnet is a material that produces a magnetic field and retains its magnetism over a long period of time. It is made from materials such as iron, nickel, and cobalt, which have strong magnetic properties.
Loudspeakers
In loudspeakers, a permanent magnet is used. The magnet is typically made of a material called neodymium, which is a type of rare earth magnet. The magnet is placed behind the speaker cone and interacts with an electromagnet to produce sound waves.
Magnetic Door Catches
In magnetic door catches, a permanent magnet is used. The magnet is often embedded in the door frame, while a metal plate is attached to the door. When the door is closed, the magnet attracts the metal plate, holding the door securely in place.
Compasses
In compasses, a permanent magnet is used. The magnet is typically a small, lightweight magnetized needle that is free to rotate. The needle aligns itself with the Earth's magnetic field, allowing the user to determine the direction of North.
None of these
None of these options is correct because all of them use permanent magnets. Loudspeakers use magnets to produce sound, magnetic door catches use magnets to hold doors in place, and compasses use magnets to determine direction. Therefore, the correct answer is option 'D', none of these.
A permanent magnet is a material that produces a magnetic field and retains its magnetism over a long period of time. It is made from materials such as iron, nickel, and cobalt, which have strong magnetic properties.
Loudspeakers
In loudspeakers, a permanent magnet is used. The magnet is typically made of a material called neodymium, which is a type of rare earth magnet. The magnet is placed behind the speaker cone and interacts with an electromagnet to produce sound waves.
Magnetic Door Catches
In magnetic door catches, a permanent magnet is used. The magnet is often embedded in the door frame, while a metal plate is attached to the door. When the door is closed, the magnet attracts the metal plate, holding the door securely in place.
Compasses
In compasses, a permanent magnet is used. The magnet is typically a small, lightweight magnetized needle that is free to rotate. The needle aligns itself with the Earth's magnetic field, allowing the user to determine the direction of North.
None of these
None of these options is correct because all of them use permanent magnets. Loudspeakers use magnets to produce sound, magnetic door catches use magnets to hold doors in place, and compasses use magnets to determine direction. Therefore, the correct answer is option 'D', none of these.
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Community Answer
In which of the following a permanent magnet not used?a)Loudspeakersb)...
Correct option is 'D'
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In which of the following a permanent magnet not used?a)Loudspeakersb)In magnetic door catchesc)In compassesd)None of theseCorrect answer is option 'D'. Can you explain this answer?
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