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Question

A dynamo does not consist of

A
a bar magnet
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B
two carbon brushes
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C
the external circuit
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D
all of these
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Solution

The correct option is A a bar magnet
A dynamo consists of
1) A horse-shoe magnet
2) An armature coil
3) Two slip rings
4) Two carbon brushes
5) The external circuit (or load)
It does not consist of a bar magnet.

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