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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
State two differences between an electromagnet and a permanent magnet.
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.
Electric bell ______.
State two factors on which the strength of induced e. m.f. depends.
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?
State two advantages of an electromagnet over a bar magnet.
State three factors which govern the speed of rotation of an electric 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.
Write the answer in your words.
How is an electromagnet made?
