Advertisements
Advertisements
प्रश्न
Fill in the blanks by writing (i) Only soft iron, (ii) Only steel, (iii) Both soft-iron and steel for the material of core and/or magnet.
Electric bell ______.
Advertisements
उत्तर
Electric bell magnet - soft iron
APPEARS IN
संबंधित प्रश्न
How will you make an iron bar electromagnet? Draw a diagram showing the polarities of the electromagnet?
Show with the aid of a diagram how a wire is wound on a U-shaped piece of soft iron in order to make it an electromagnet. Complete the circuit diagram and label the poles of the electromagnet.
State three uses of an electromagnet?
Answer the following in short.
Name a few common appliances that use electromagnets.
A straight wire is held vertical and current is passed in it in the upward direction. A compass needle is kept near the wire in north of it. How is the needle deflected? What is the change in the deflection of the needle if the current in wire is reversed?
Describe a simple Experiment to demonstrate that there Exists a magnetic field around a current-carrying conductor.
A straight current-carrying conductor is kept in a magnetic field. It Experiences a force. State three factors on which the magnitude of force Experienced by the conductor depends. Under what condition will the conductor Experience no force?
How does a magnetic field set up by a solenoid change when strength of current in the solenoid is decreased?
State two advantages of an electromagnet over a bar magnet.
State the energy change that takes’place in a D. C. motor.
