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प्रश्न
What is a permanent magnet? Give one use of it.
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उत्तर
A permanent magnet is a magnet made from steel such that once magnetized, it does not lose its magnetism easily. Use: It is used in the galvanometer.
संबंधित प्रश्न
Name and state the rule by which polarity at the ends of a current carrying solenoid is determined.
Describe a simple Experiment to demonstrate that there Exists a magnetic field around a current-carrying conductor.
How does a magnetic field set up by a solenoid change when strength of current in the solenoid is decreased?
Why is soft iron generally used as the core of the electromagnet?
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.
The primary windings of a step-up transformer are usually made of thicker wire than the secondary. Explain.
Point out three differences between an electromagnet and a bar (or permanent) magnet.
State and explain Maxwell’s Cork Screw Rule.
How does a magnetic field set up by a solenoid change when cross-sectional area of solenoid is increased?
