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Why voltage divider bias is also called self bias?

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The trace on an oscilloscope continually moves to the right of the screen when 

(a) the sweep is triggered. (b) the sweep period is larger than the signal period. (c) the sweep period is smaller than the signal period. (d) there is no weep.

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The trace on an oscilloscope continually moves to the right of the screen when the sweep period is smaller than the signal period. 

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