ΜC negative charge sitting in an electric field moves away from the source charge. The electric potential difference of the moving charge is measured as 1J/C. How much work or energy was added to the system to get the charge to move.

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

iron would move it is magnetic there is a mag field around the current in the wire

thermal energy is the answer

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