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प्रश्न
List out the uses of magnets.
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उत्तर
- In ancient times, the magnet in the form of ‘direction stone’ helped seamen to find the directions during a voyage.
- Nowadays, magnets are used to generate electricity in dynamos.
- Electromagnets are used in our day-to-day life.
- They are used in electric bells and electric motors.
- They are used in loudspeakers and microphones.
- An extremely powerful electromagnet is used in the fast-moving Maglev train to remain floating above the tracks.
- In industries, magnetic conveyor belts are used to sort out magnetic substances from scraps mixed with non-magnetic substances.
- Magnets are used in computers in their storing devices such as hard disks.
- In banks, the magnets enable the computers to read the MICR numbers printed on a cheque.
- The tip of the screw drivers is made slightly magnetic so that the screws remain attached to the tip.
- At hospitals, extremely strong electro magnets are used in the MRI (Magnetic Resonance Imaging) to scan the specified internal organ.
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संबंधित प्रश्न
Write true or false for a given statement.
A current-carrying coil, when suspended freely, can rest in any direction.
Fill in the blank
Like poles ______ each other and unlike poles _____
Select the correct alternative
A freely suspended magnet rests in
Draw a clearly labelled diagram, to show how a steel bar is magnetised by a divided touch method. A written description is not required.
Draw the magnetic field lines around a bar magnet when a bar magnet is placed such that the N pole points North.
Magnets are used in _______ for generating electricity.
Why it is not advisable to slide a magnet on an iron bar back and forth during magnetising it?
What will happen when we place magnets near cell phones, computers, and DVDs?
What are the factors that determine the strength of the magnet?
