Advertisements
Advertisements
Question
Using an electromagnet, you can make a working model of a railway signal as shown in figure.
Advertisements
Solution
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.
APPEARS IN
RELATED QUESTIONS
An electromagnet does not attract a piece of iron.
An electric bell has an electromagnet.
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.
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
For the coil in the diagram below, when the switch is pressed:
(a) what is the polarity of end A?
(b) which way will the compass point then?
Write the correct option by observing the figures.
A soft iron bar is introduced inside the current-carrying solenoid. The magnetic field inside the solenoid ____________.
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.
The figure given below shows the magnetic field around the conductor. Study it and answer the questions:
- What changes are caused by increasing current?
- What do you see when the magnetic needle is kept a little away from the wire?
- In the second part of the figure, the iron filings arrange themselves in a circular manner around the wire. Why does this happen?
Make four electromagnets with 20, 40, 60 and 80 turns. Connect them one by one to a battery of 2 cells. Bring the electromagnet near a box of pins. Count the number of pins attracted by it. Compare the strengths of the electromagnets.
