Question: An investigator places a sample (1.0 mathrm{~cm}) from a wire carrying a large current; the strength of the magnetic field has a particular value at

An investigator places a sample $1.0 \mathrm{~cm}$ from a wire carrying a large current; the strength of the magnetic field has a particular value at this point. Later, she must move the sample to a $5.0 \mathrm{~cm}$ distance, but she would like to keep the field the same. By what factor must she increase the current?

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