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प्रश्न
What will be the effect on the working of an electric bell if instead of a direct current an alternating current is used?
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उत्तर
If electric bell is connected to a.c. instead of d.c. then bell will ring intermittently.
संबंधित प्रश्न
Suppose you are given a long bar magnet and you are asked to break it into four small magnets. Draw diagrams showing the polarities of each broken part.
Name and state the rule by which polarity at the ends of a current carrying solenoid is determined.
Answer the following in short.
Name a few common appliances that use electromagnets.
Why is soft iron generally used as the core of the electromagnet?
State three factors which govern the speed of rotation of an electric motor.
State the energy change that takes’place 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.
Point out three differences between an electromagnet and a bar (or permanent) magnet.
