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Find out the volume of that object and then the mass of it and divide the mass by the volume to get the density.
Comment:
The answer given above is very wrong(in electricity).
Answer:
Bus bars carry high currents and thus a current transformer is used. It uses the bus bar as its primary winding and its wound section as its secondary winding. The magnetic flux of the bus bar due to its current is very small thus the current in the secondary windings will be small as well and safe to measure with a traditional Ammeter.
NB: These types of work must only be carried out by a qualified electrician. Don't put your life at risk.
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