6 A student mixed 100 mL of water at 20 °C with 100 mL of water at 80 °C. He
briefly stirred the mixture for 10 seconds and measured the temperature. The
measured temperature of the mixture of water was –
F 25 °C
G 40 °C
H 50 °C
J 65 °C
I

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?