)Given a current-carrying copper wire, what happens to a magnetic needle placed nearby? (Hint: magnetic needle can be considered as a small bar magnet) A) It orients itself in the direction of the magnetic field generated by the wire B) It orients itself in a direction perpendicular to the magnetic field generated by the wire C) It remains stationary D) It orients itself in the direction of the Earth's magnetic field E) It is positioned along the wire

What will happen when the north pole of one bar magnet is brought close to the north pole of a second bar magnet?There will be an attractive force between the two north polesThe magnets will accelerate towards one anotherThere will be no force between the two north polesThere will be a repulsive force between the two north poles2A student is experimenting with a bar magnet and a plotting compass.  As she moves the plotting compass around the bar magnet, the needle inside the compass rotates.  Which one of the following statements is correct?The needle always points opposite to the direction of the magnetic fieldThe needle always points directly towards the north pole of the bar magnetThe needle always points directly towards the south pole of the bar magnetThe needle always points in the direction of the magnetic field3Which of the following statements is incorrect?The Earth’s magnetic south pole is in the Southern HemisphereThe magnetic field of the Earth is stronger at the poles than it is at the EquatorThe magnetic field of the Earth (and any magnet) is stronger where the field lines are closer togetherAs long as there aren’t any strong magnets nearby, a compass needle will always point in the direction of the Earth’s magnetic field4Which of the following statements about permanent magnets is incorrect?They produce their own magnetic fields and always have a north pole and a south poleThe force between two permanent magnets will increase when they are brought closer to one anotherThey can be attracted to or repelled by other permanent magnetsUnder certain circumstances, they will only be attracted to other permanent magnets5An iron nail is initially unmagnetised.  Which one of the following things will occur when it is brought closer to the north pole of a permanent bar magnet?Nothing will happen since the iron nail is not a permanent magnetThe iron nail will be repelled by the bar magnetThe iron nail will be permanently magnetisedThe end of the nail which is placed closest to the north pole of the bar magnet will become an induced south pole

​the diagram below shows a current carrying wire placed inside a magnetic coil.State the difference it would make if the wire is replaced with a coil with more turns.Secondly the direction of current is reversed and the poles of the magnets are also reversed.Describe your answer in 25 to 35 words.B

A vertical wire carries a current upward. The magnetic field at north of the wire will be directed.

A coil of wire is carrying an electric current. How will the magnetic field of the coil be affected if an iron rod is placed in its center ?A The field will be cancelled out. B The strength of the field will increase. C The strength of the field will decrease. D The direction of the field will reverse.

A compass needle is a small magnet on a pivot. The needle can swing around freely.Explain why one end of the needle points north.