18. Which of these two circuits A or B shows the correct observation? Give reason.
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ANSWER IS ‘A'
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Answer:
Circuit A shows the correct observation.
Explanation:
This figure shows an experiment to show that certain fruits and vegetables are also good conductors of electricity. A half-cut potato is connected to the circuit. After some time, one end of the potato that is connected to the copper wire will turn greenish-blue in color. The other end will remain unaffected. This color change occurs only at the end that is connected to the positive terminal of the battery. So circuit A is the correct option.
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