Suppose the primary coil of an electric transformer is connected to a typical outlet at home. a) What is the voltage at the secondary coil of the transformer if the primary coil has 24 turns and the secondary has only 4? b) What is the output voltage if now the primary has 4 turns and the secondary 24? c) Explain the general procedure to get the output voltage.

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?