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प्रश्न
Name any two appliances which works on the phenomenon of magnetic effect of electric current.
Name any three appliances based on the magnetic effect of electric current.
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उत्तर
Ammeter, microphone, electric bell, galvanometer, loud speaker, electric generator, electric motor, telephone receiver, radio, stereo speaker.
संबंधित प्रश्न
An electromagnet does not attract a piece of iron.
Name the scientist who discovered the magnetic effect of current.
Fill in the following blank with suitable words:
The magnetic effect of a coil can be increased by increasing the number of ........... increasing the ........... or inserting an ........... core.
What is Maxwell's corkscrew rule? For what purpose is if used?
If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be:
(a) west pole
(b) south pole
(c) north pole
(d) east pole
The magnetic effect of current was discovered by:
(a) Maxwell
(b) Fleming
(c) Oersted
(d) Faraday
Name one device which works on the magnetic effect of current.
What device reverses the current?
The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was ______.
A coil is connected to a galvanometer. When the N-pole of magnet is pushed into the coil, the galvanometer deflected to the right. What deflection, if any, is observed when:
the S-pole is inserted?
(b) State whether the following statements are true or false:
(i) Magnetic poles exist in pairs.
(ii) Global warming is a desirable aspect of the intensified greenhouse effect.
(b) State whether the following statements are true or false:
(i) Magnetic poles exist in pairs.
Draw magnetic field lines produced around a straight current carrying conductor passing through a cardboard. How will the strength of the magnetic field change when the point where magnetic field is to be determined is moved away from the conductor?
A soft iron bar is introduced inside the current-carrying solenoid. The magnetic field inside the solenoid ____________.
Unscramble the following words:
HTRCO
Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?
How does the magnetic effect of electric current help in the working of an electric bell? Explain with the help of a diagram.
Sailors use ______ to find direction in order to navigate on the sea.
Using an electromagnet, you can make a working model of a railway signal as shown in figure.
