Discussion
Which of the following can be used to complete an electric circuit if one runs out of connecting wire ?
Answer: D
One can use a blade.
A circuit needs a conducting path. A blade is made of metal (steel), which conducts electricity, so it can bridge the gap left by a missing wire, as in the simple tester activities of the NCERT science books.
Paper, rubber and wood are insulators: they do not allow current to pass, so a paper strip, a rubber belt or a wooden stick would leave the circuit open.
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