Why are magnetic field lines due to current in a straight conductor denser near the wire and farther apart as distance increases?

Question

Why are magnetic field lines due to current in a straight conductor denser near the wire and farther apart as distance increases? — Exam MCQ

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D. Because magnetic field strength decreases with increasing distance from the wire — The correct choice is Because magnetic field strength decreases with increasing distance from the wire. The result follows from the relevant magnetic-field, electromagnetic-induction or Fleming/right-hand-rule principle.

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A. Because of interference from external magnets only

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B. Because the magnetic field becomes uniform farther away

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C. Because the current in the wire decreases with distance

Why are magnetic field lines due to current in a straight conductor denser near the wire and farther apart as distance increases?

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