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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.
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उत्तर १
The strength of the magnetic field of an electromagnet depends on:
- Number of turns: The strength of the magnet increases with the number of turns of the winding in the solenoid.
- Current: The strength of the magnetic field increases with increasing current through the solenoid.
उत्तर २
Factors on which the strength of the magnetic field of an electromagnet depends are:
- The number of turns in the solenoid. If the number of turns in the solenoid increases or decreases, the magnetic intensity also increases or decreases.
- It is directly proportional to the strength of the current that flows in the turns of the solenoid.
- It is found to increase further if a soft iron piece, called core, is placed along the axis of the solenoid inside it.
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संबंधित प्रश्न
Fill in the blanks by writing (i) Only soft iron, (ii) Only steel, (iii) Both soft-iron and steel for the material of core and/or magnet.
Electromagnet ______.
State two factors on which the strength of induced e. m.f. depends.
How does a magnetic field set up by a solenoid change when number of turns are increased?
State three factors which govern the speed of rotation of an electric motor.
State the factors that can increase the speed of rotation of the coil in a D.C. motor.
State the principle of a D. C. motor.
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 position of armature coil relative to the direction of magnetic field, in a D. C. motor when the deflecting couple acting and the coil is minimum.
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.
Point out three differences between an electromagnet and a bar (or permanent) magnet.
