I encourage you to not just take my word for it, but to investigate it for yourself. Yes, the page loads, but the section "Two_models_for_magnets:_magnetic_poles_and_atomic_currents" isn't there (anymore). You are effectively pointing to page 300 of a book with only 200 pages. True, but what's "internal" about then? And why did you refer to a field as an "effect"? No problem; glad I could help.