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B
Electric current can pass through a sheet of thermocol
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C
When current flows through a circuit, the circuit is called open circuit
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D
Electric current can flow through metals
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Solution
The correct option is D
Electric current can flow through metals
1)Electric bulb has two terminals. 2)Thermocol is poor conductor of electricity. 3)If the circuit is open, current won't flow through it. 4)Metals are good conductors of electricity.