a compass needle normally points toward earths magnetic pole, which is near the north pole. which best…
a compass needle normally points toward earths magnetic pole, which is near the north pole. which best explains why the needle moves away from the pole when it comes close to a current - carrying wire?\ncurrent within the wire weakens the magnetic force of the pole.\nmagnetism surrounding the wire weakens the magnetic force of the pole.\ncurrent within the wire draws the needle toward the wire.\nmagnetism surrounding the wire draws the needle toward the wire.
Answer
Brief Explanations:
When there is a current - carrying wire, it creates a magnetic field around it (Oersted's discovery). The compass needle, which is affected by the Earth's magnetic field normally, now experiences a stronger magnetic influence from the current - carrying wire's magnetic field. The current within the wire itself does not weaken the Earth's magnetic force (so the first option is wrong). It is the magnetism (magnetic field) surrounding the wire that interacts with the compass needle. The wire's magnetic field is what causes the needle to move, not the current within the wire directly drawing the needle (the third option is incorrect in terms of the physical mechanism - it's the magnetic field, not the current itself in that sense). And it's not that the wire's magnetism weakens the Earth's magnetic force (the second option is wrong), but rather that the wire's magnetic field exerts a stronger force on the needle in a different direction.
Answer:
Magnetism surrounding the wire draws the needle toward the wire.