Which type of reaction occurs when you bake a tray of cookies?
a. exothermic, because energy is released to the surroundings
o
b. endothermic, because energy is absorbed from the surroundings
o
c. exothermic, because energy is absorbed from the surroundings
o
d. endothermic, because energy is released to the surroundings

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?