Advertisements
Advertisements
Question
How does a magnetic field set up by a solenoid change when cross-sectional area of solenoid is increased?
Advertisements
Solution
By having a solenoid of large diameter or more cross-sectional area, the intensity of magnetic field increases.
RELATED QUESTIONS
State two ways of magnetising an iron piece?
State three uses of an electromagnet?
principle of an electric motor ?
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.?
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?
What is a permanent magnet? Give one use of it.
State three factors which govern the speed of rotation of an electric motor.
State the energy change that takes’place in a D. C. motor.
State the function of a split ring in D.C. motor.
