12. A lump of ice (density 920kg/m”) is put into a tumbler containing a coke. The density of<br />coke is 1150kg/m? What fraction of the lump of ice will be above the surface of the<br />coke?​

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?