हिंदी

Name any two appliances which works on the phenomenon of magnetic effect of electric current.

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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.

एक पंक्ति में उत्तर
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उत्तर

Ammeter, microphone, electric bell, galvanometer, loud speaker, electric generator, electric motor, telephone receiver, radio, stereo speaker.

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अध्याय 4: Effects of electric current - Solve the following Questions

संबंधित प्रश्न

When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.


Will the compass needle show deflection when the switch in the circuit shown by figure is closed?


Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.


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.


Name one device which works on the magnetic effect of current.


How should the electric lamps in a building be connected so that the switching on or off in a room has no effect on other lamps in the same building?


In the Activity shown below, how do we think the displacement of rod AB will be affected if

  1. current in rod AB is increased
  2. a stronger horse-shoe magnet is used
  3. length of the rod AB is increased?
  • Take a small aluminium rod AB (of about 5 cm). Using two connecting wires suspend it horizontally from a stand, as shown in Fig.
  • Place a strong horse-shoe magnet in such a way that the rod lies between the two poles with the magnetic field directed upwards. For this put the north pole of the magnet vertically below and south pole vertically above the aluminium rod (Fig.).
  • Connect the aluminium rod in series with a battery, a key and a rheostat.
  • Now pass a current through the aluminium rod from end B to end A.
  • What do you observe? It is observed that the rod is displaced towards the left. You will notice that the rod gets displaced.
  • Reverse the direction of current flowing through the rod and observe the direction of its displacement. It is now towards the right.
  • Why does the rod get displaced?


A current-carrying rod, AB, experiences a force perpendicular to its length and the magnetic field. Support for the magnet is not shown here, for simplicity.


When the resistance of a conductor increases, the current ____________ .

(c) Considering the relationship in the first pair, complete the second paie :
AgCI : White :: CuI2 : ___________


Identify the given figure, write the labels of it.


A soft iron bar is introduced inside the current-carrying solenoid. The magnetic field inside the solenoid ____________.


If the key in the given arrangement is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are ____________.


In the arrangement shown in Figure  there are two coils wound on a non-conducting cylindrical rod. Initially the key is not inserted. Then the key is inserted and later removed. Then


A magnetic compass shows a deflection when placed near a current carrying wire. How will the deflection of the compass get affected if the current in the wire is increased? Support your answer with a reason.


Magnetic effect of current was discovered by ______.


Unscramble the following words:

HTRCO


______ are also used to remove splinters of steel or iron in hospitals dealing with eye injuries.


Sailors use ______ to find direction in order to navigate on the sea.


A rectangular loop ABCD carrying a current I is situated near a straight conductor XY, such that the conductor is parallel to the side AB of the loop and is in the plane of the loop. If a steady current I is established in the conductor as shown, the conductor XY will ______.


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