हिंदी

What Device Reverses the Current?

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प्रश्न

 What device reverses the current?

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उत्तर

 A commutator (split rings) reverses the current.

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अध्याय 5: Magnetic Effects of Electric Current - Exercise 3 [पृष्ठ ९२]

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लखमीर सिंग Physics [English] Class 10
अध्याय 5 Magnetic Effects of Electric Current
Exercise 3 | Q 20.2 | पृष्ठ ९२

वीडियो ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्न

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.


Fill in the following blank with suitable words:

 If a coil is viewed from one end and the current flows in an anticlockwise direction, then this end is a ........... pole.


What is Maxwell's corkscrew rule? For what purpose is if used?


Which way does the wire in the diagram below  tend to move? 

 


When the switch S is closed in the figure given below, the pointer of the galvanometer moves to the right.  

 

If S is kept closed, will the pointer:

(a) return to zero?
(b) stay over on the right?
(c) move to the left and stay there
(d) move to and fro until S is opened


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.


What is the function of a split ring in an electric motor?


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

(ii) Global warming is a desirable aspect of the intensified greenhouse effect.


Answer the following question:
State the effect on the magnetic needle in Oersted’s experiment when:  
(a) the current is passed through the wire.  
(b) the current through the wire is increased
(c) the current through the wire is reversed. 


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.


How does the magnetic effect of electric current help in the working of an electric bell? Explain with the help of a diagram.


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


What do you mean by the magnetic effect?


A wire with green insulation is usually the live wire of an electric supply.


Define the magnetic effect of electric current.


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