Advertisements
Advertisements
प्रश्न
What is an electric motor?
उत्तर
Electric motor : An electric motor is a device which converts the electrical energy into the mechanical energy.
APPEARS IN
संबंधित प्रश्न
Name two factors on which the strength of magnetic field of an electromagnet depends and state how does it depend on the factors stated by you.
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
(a) The no. of turns in the secondary is doubled?
(b) The part X of the transformer is removed?
( c) The core of the transformer is made out of copper?
(d ) The A.C. supply is replaced by D.C.?
Complete the following sentence :
On reserving the direction of current in a wire, the magnetic field produced by it gets _____.
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 number of turns are increased?
State the condition when an electric charge can give rise to a magnetic field.
Point out three differences between an electromagnet and a bar (or permanent) magnet.
State and explain Maxwell’s Cork Screw Rule.
Write the answer in your word.
How is an electromagnet made?
