According to the text, what is the fundamental relationship discovered between electricity and magnetism?, How does the pattern of magnetic field lines in an electromagnet compare to those of a permanent bar magnet?, What specific action by Oersted caused the magnetic compass needle to change its direction?, Why does the text advise caution when using iron filings in Activity 13.6A?, What is the effect of winding a wire into a coil on the magnetic field's concentration?, In Oersted's experiment, what was the significance of swapping the battery connections?, Looking at the diagram on page 173, how can you visually determine where the magnetic field is strongest?, What happens to the magnetic field of an electromagnet if the electric current is turned off?, How does the text describe the strength of a magnetic field around a single straight wire?, What was the unexpected observation Oersted made during his lecture in 1820?, Based on the diagrams, what is the geometric shape of the field lines around a straight conductor?, If you want to increase the strength of an electromagnet without changing the current, what physical modification does the text suggest?, What determines the polarity (North and South) of an electromagnet?, Why are iron filings or small compasses used in these experiments?, Does the magnetic field exist only inside the coil or also around it?, What role does the "low voltage supply" play in the diagram on page 172?, How does the distance from the wire affect the magnetic field's intensity?, What was Oersted's profession according to the text?, What was Oersted's profession according to the text?In the summary, what is the key phrase that links current and space?, What is the difference between the field of a single wire and a coil in terms of "space"?.

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