Weight of the body in water
1. & gold smith claims that an ornament is made
of pure gold of density 19.32g/cm^3.
a chain made from this gold weighs 25.25 g .The
apparent weight of the chain when
immersed in water is 23.075 g. using a suitable calculation
determine the purity of gold

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?