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A very long straight current-carrying wire produces a magnetic field of 20 mT at a distance...

  1. A very long straight current-carrying wire produces a magnetic field of 20 mT at a distance 2 m from the wire. What is value of the current that produces this filed at 2 m from the wire? To measure a field of 5 mT due to current in this wire, at what distance from the wire should you keep the measuring device to measure the magnetic field? If you double the current what will be the filed strengths at these two points?

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