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I have posted my question as an attachement. please refer to that .

         I have posted my question as an attachement.  please refer to that .

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Grade:10

1 Answers

M H Rashid
35 Points
6 years ago
When the length changes, the cross sectional area may or may not change. If the length is increased by stretching, the area decreases. If the length of a thick bar is decreased by compression, the area increases. But you cannot decrease the length of a thin wire by compressing it along its longitudinal axis. Therefore it will be assumed that the length has been decreased by cutting off the filament wire. Hence the cross sectional area does not change.
Therefore the change in power will be calculated without changing resistivity and area. When length decreases, resistance decreases and power increases (at constant voltage). In this problem the power increases by about 11%. The answer is B.

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