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Required information

Some animals are capable of detecting magnetic fields and use this sense to help them navigate. Suppose a high$-$voltage

direct$-$current power line carries a current of $5\mathrm{.}10kA.$

On a long$-$distance flight, the pigeon is flying at an altitude of $541\mathrm{.}0m.$ What would the magnetic field be at that distance from the

power line?

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