​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 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.

The figure shows a simple electromagnet made of a coil of insulated wire wrapped around an iron nail.When the switch closed, which of the following will make this electromagnet stronger? (i) increasing the number of coils(ii) adding more turns to the coil(iii) increasing the direct current flowing through the coil(iv) changing the direct current flowing through the coil to alternating current.*1 point

Refer to the image below and state how the magnetic field pattern indicates regions wherethe magnetic field is stronger outside the magnet? What happens to the magnetic fieldwhen the current in the circuit is reversed?

Imagine a current carrying circular loop ofwire on the plane of your answer sheet. Themagnetic field inside the loop is into the planeof the paper.(i) What must be the direction of the currentin the loop?

)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