Question

You are in New Zealand in the winter and it is cold. You decide to buy an electric blanket and notice that there is a safety notice that says “if pregnant you shouldn’t use this due to possible health risk to the baby from magnetic fields.” The wire carries a 1A current.

a) Estimate, and give your reasoning behind your estimate, the magnetic field strength the baby experiences inside the womb, and how does this value compare to the Earth’s magnetic field?

b) How would you redesign the blanket so that the magnetic field created by the blanket would effectively be zero?

Answer 1