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प्रश्न
How does a magnetic field set up by a solenoid change when number of turns are increased?
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उत्तर
By having more number of turns, the intensity of magnetic field increases.
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.
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.
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?
Why is soft iron generally used as the core of the electromagnet?
What is a permanent magnet? Give one use of it.
State the factors that can increase the speed of rotation of the coil in a D.C. motor.
What is dynomo (a.c. generator)? State the principle on which it works.
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.
