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प्रश्न
How does a magnetic field set up by a solenoid change when cross-sectional area of solenoid is increased?
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उत्तर
By having a solenoid of large diameter or more cross-sectional area, the intensity of magnetic field increases.
संबंधित प्रश्न
The diagram shows a coil wound around a U shape soft iron bar AB.
1) What is the polarity induced at the ends A and B when the switch is pressed?
2) Suggest one way to strengthen the magnetic field in the electromagnet
3) What will be the polarities at A & B if the direction of current is reversed in the circuit?
State two ways of magnetising an iron piece?
How will you make an iron bar electromagnet? Draw a diagram showing the polarities of the electromagnet?
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.
State three uses of an electromagnet?
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.?
State two factors on which the strength of induced e. m.f. depends.
Why is soft iron generally used as the core of the electromagnet?
State the position of armature coil relative to the direction of magnetic field, in a D. C. motor when the deflecting couple acting an the coil is maximum.
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.
