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A short chain is usual attached to the back of a petrol tanker trailing...

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Question 72
petrol tanker is balanced on the wh eel
heat generated by friction in the engine can be conducted to the floor
charges generated by friction in the tanker can be conducted to the earth
the tanker moves slowly as the chain touches the floor
chain produces sound for the resonance of the tanker engine

Explanation not provided, please join discuss, your contributions are welcomed

Correct option: C

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