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Q.

Which one of these is a source of alternating current? 


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a

Dry cell

b

AC generators 

c

DC transformer

d

None of these  

answer is B.

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Detailed Solution

AC generators are a source of alternating current.
The direction of ac current changes in each cycle and to produce alternating current dc generators are used.
The fundamental idea of electromagnetic induction serves as the foundation for the main working principle of an AC generator.
An electric current is produced in a conducting coil when it is rotated in a constant magnetic field or exposed to a fluctuating magnetic field.
The objective of an AC generator is to transform mechanical energy into alternating current, which is electrical energy.
                                                                                        
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Which one of these is a source of alternating current?