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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
State two ways of magnetising an iron piece?
principle of an electric motor ?
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 the two properties of the magnetic lines of force around a circular coil.
State the purpose of the iron core.
How does a magnetic field set up by a solenoid change when strength of current in the solenoid is decreased?
State two advantages of an electromagnet over a bar magnet.
State the factors that can increase the speed of rotation of the coil in 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 and the coil is minimum.
(i) A straight wire conductor passes vertically through a piece of cardboard sprinkled with iron filings. Copy the diagram and show the setting of iron filings when a current is passed through the wire in the upward direction and the cardboard is tapped gently. Draw arrows to represent the direction of the magnetic field lines.
(ii) Name the law which helped you to find the direction of the magnetic field lines.
