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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
Tick the most appropriate answer.
Which of the following methods is used to magnetize a magnetic without touching it by a magnet?
State two differences between an electromagnet and a permanent magnet.
What is an electric motor?
The magnetic flux through a coil having 100 turns decreases from 5 milli weber to zero in 5 second. Calculate the e.m.f. induced in the coil.
Answer the following in short.
Name a few common appliances that use electromagnets.
State the two properties of the magnetic lines of force around a circular coil.
What is a permanent magnet? Give one use of it.
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 an the coil is maximum.
State important properties (or characteristics) of magnetic lines of force around a straight conductor.
