A coil of wire with 60 turns lies on the plane of the page, and a uniform magnetic field points into the page with a strength of 1.30 T. The coil has an initial area of 0.790 m2 and is then elongated so that its area decreases to 0.370 m2 in 0.80 s. What is the magnitude of the average induced emf in the coil while its area is changing

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?