Advertisements
Advertisements
प्रश्न
Answer the following in short.
Name a few common appliances that use electromagnets.
Advertisements
उत्तर
Electric bells, electric motor, telephones, loudspeakers, and generators are few common appliances that use electromagnets.
APPEARS IN
संबंधित प्रश्न
How will you make an iron bar electromagnet? Draw a diagram showing the polarities of the electromagnet?
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.
State two factors on which the magnitude of an induced e.m.f. in the secondary coils of a transformer depends.
The magnetic flux through a coil having 100 turns decreases from 5 milli weber to zero in 5 second. Calculate the e.m.f. induced in the coil.
State two factors on which the strength of induced e. m.f. depends.
State the two properties of the magnetic lines of force around a circular coil.
How does a magnetic field set up by a solenoid change when number of turns are increased?
State the principle of a D. C. motor.
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
State the factors, on which depends the magnitude of the force acting on current carrying conductor, when it is kept in a magnetic field perpendicular to it.
