Advertisements
Advertisements
प्रश्न
State the purpose of the iron core.
Advertisements
उत्तर
The purpose of the iron core is to intensify the strength of the magnetic field inside the solenoid and thereby increase the strength of the electromagnet.
संबंधित प्रश्न
State two ways of magnetising an iron piece?
Name and state the rule by which polarity at the ends of a current carrying solenoid is determined.
State two differences between an electromagnet and a permanent magnet.
Name the material of core in (a) an electric bell, (b) electromagnet, (c) a d.c. motor, (d) an a.c. generator and (e) a transformer.
Name the type of transformer shown in Fig. What changes will you observe regarding the brightness of the lamp, if
- the number of turns in the secondary is doubled? Explain.
- the part X of the transformer is removed?
- the core of the transformer is made out of copper?
- the A.C. supply is replaced by D.C.?
Answer the following in short.
Name a few common appliances that use electromagnets.
Describe briefly one way of producing an induced current in a coil. State one factor that determines the magnitude of induced e.m.f.
State the two properties of the magnetic lines of force around a circular coil.
State the principle of a D. C. motor.
Point out three differences between an electromagnet and a bar (or permanent) magnet.
