Question

horatio drew a diagram to illustrate how magnetism is produced by electric currents. which best explains horatios error? magnetism is not produced by electric currents unless the wire is coiled. the magnetic field does not continually spread outward from the wire. the magnetic field is produced inside the wire, not outside of it. magnetism is only produced when a metal bar is placed near the wire.

Explanation:

1. Analyze Option 1: A straight wire with current also produces a magnetic field (not just coiled), so this is wrong.
2. Analyze Option 2: The magnetic field around a current - carrying wire is circular (like concentric circles), not spreading outward like in the diagram. This matches the error in the diagram.
3. Analyze Option 3: The magnetic field is produced both inside and outside the wire (though stronger outside for a conducting wire), so this is incorrect.
4. Analyze Option 4: A current - carrying wire produces a magnetic field on its own, no metal bar is needed, so this is wrong.

Answer:

The magnetic field does not continually spread outward from the wire.