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Question
Which labels identify the two carbon brushes?
Options
\[B_1\text{ and }B_2\]
\[R_1\text{ and }R_2\]
\[A\text{ and }R\]
\[N\text{ and }S\]
MCQ
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Solution
The two carbon brushes are labelled \[B_1\] and \[B_2\]. They press against the slip rings and carry current to the external circuit.
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