Density depends on mass and volume so option D is correct answer. Hope this helps!
Some are out but will be on Netflix June 17

<u>Hydroelectric power,</u> also called hydropower is the electricity produced from generators driven by turbines that convert the potential energy of falling or fast-flowing water into mechanical energy.
Because,
In left image pin is not touch to the wire.
In right image pin is touch to the wire.
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