Advertisements
Advertisements
प्रश्न
Using an electromagnet, you can make a working model of a railway signal as shown in figure.
Advertisements
उत्तर
Working Model of a Railway Signal Using an Electromagnet
Components:
- Cardboard Signal: Indicates the railway signal.
- Electromagnet: Coil wrapped around an iron nail.
- Battery: Powers the electromagnet.
- Switch: Controls the electromagnet.
- Thread: Connects the electromagnet to the cardboard signal.
Steps:
-
Setup:
- Mount the cardboard signal on a stand.
- Attach a thread to the signal and pass it over a pulley to the electromagnet.
-
Electromagnet Creation:
- Wrap a coil of wire around an iron nail.
- Connect the coil to a battery via a switch.
-
Operation:
- Turning on the switch powers the electromagnet.
- The electromagnet pulls the iron nail, moving the thread and changing the signal's position.
- Turning off the switch deactivates the electromagnet, allowing the signal to return.
Visual Representation:
The provided image illustrates the setup with labelled components, demonstrating how the electromagnet controls the railway signal.
संबंधित प्रश्न
What device reverses the current?
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
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?
Explain the magnetic field created around a straight current carrying conductor with the help of a diagram.
What is that instrument which can detect the presence of electric current in a circuit?
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.
Edison used a ______ wire coil is a vacuum glass and discovered the first electric bulb in 1879.
What do you mean by the magnetic effect?
A student was asked to perform an experiment to study the force on a current carrying conductor in a magnetic field. He took a small aluminium rod AB, a strong horse shoe magnet, some connecting wires, a battery and a switch and connected them as shown. He observed that on passing current, the rod gets displaced. On reversing the direction of current, the direction of displacement also gets reversed. On the basis of your understanding of this phenomenon, answer the following questions:
- Why does the rod get displaced on passing current through it?
- State the rule that determines the direction of the force on the conductor AB.
-
- If the U-shaped magnet is held vertically and the aluminium rod is suspended horizontally with its end B towards due north, then on passing current through the rod from B to A as shown, in which direction will the rod be displaced?
- Name any two devices that use current carrying conductors and magnetic fields.
OR
Draw the pattern of magnetic field lines produced around a current carrying straight conductor held vertically on a horizontal cardboard. Indicate the direction of the field lines as well as the direction of current flowing through the conductor.
