Question 17A student wraps a copper wire around a nail and then connects the wire to a battery.Which statement describes the role of the nail in this set-up?A The nail is an electromagnet. The current in the wire induces a magnetic field from the nail.B The nail is a permanent magnet. The current in the wire induces a magnetic field from the nail.C The nail is an electromagnet. The magnetic field from the nail induces an electric current in the wire.D The nail is a permanent magnet. The magnetic field from the nail induces an electric current in the wire.

Which three items below are used to make an electromagnet? aa battery ba coin ca cork da nail esome thin wire

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 pointii, iiii, ii, iiiii onlyiii only

A student wrapped 30 cm of an insulated wire around the middle of an iron rod, leaving ends A and B exposed. She connected the non-insulated ends of the wire to a battery. She brought a permanent magnet near end B of the iron rod, and it was repelled. The picture shows the student's experiment.Which best explains why the permanent magnet was repelled?A The wire became magnetized when an electric current flowed through it, and end B of the iron rod must have shared the same pole with the permanent magnet.B The iron rod became magnetized when it was wrapped by the wire, and end B of the iron rod must have had a pole opposite that of the permanent magnet.C The iron rod became magnetized when it was wrapped by the wire, and end B of the iron rod must have shared the same pole as the permanent magnet.D The wire became magnetized when an electric current flowed through it, and end B must have had a pole opposite that of the permanent magnet.

)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

Boojho made an electromagnet by winding 50 turns of wire over an iron screw. Paheli also madean electromagnet by winding 100 turns over a similar iron screw. Which electromagnet will attractmore pins? Give reason.Question 8.Does the electric current have other effect except heating? Name it.Question 9.Explain the following.(a) Copper and aluminium wires are usually employed for electricity transmission. Explain thereason.(b) Explain how does the resistance of a wire vary with its length.(c) The tungsten is used almost exclusively for filament of electric lamp. Comment.www.n