Reference no: EM13781328

What does a magnet attract? Select one: a. Anything made of metal b. Aluminum foil c. Iron, steel, nickel and other magnets d. Some types of plasticsThe part of a magnet where the magnetic field and forces are strongest is called a magnetic _____. Select one: a. field b. pole c. attraction d. repulsionCan you create electricity with a magnet? Select one: a. Yes, by rotating a coil of wire between two poles of a permanent magnet b. Yes, by putting a current through a wire around a magnet c. No, because it can only be done at large power plants using a huge turbine d. No, because only friction on electric charges or batteries create electricityWhat can cause a magnet to lose its magnetism? Select one: a. leaving it outside in the hot. b. leaving it outside in the cold. c. remagnetize it. d. dropping it.Which of the following does not describe a solenoid? Select one: a. It consists of a long straight coil of wire b. They can be used to generate a magnetic field similar to that of a bar magnet. c. They have many practical applications. d. The magnetic field of a solenoid is decreased by adding an iron core.Which of the following will increase the strength of an electromagnet? Select one: a. plastic core b. less coils c. more coils d. weaker electricityThe process of producing an electrical current by moving a magnet in and out of a coil of wire is called _____. Select one: a. magnetic deduction b. electromagnetic induction c. magnetic reduction d. magnetic productoinWhen touching a permanent magnet to iron, the iron becomes magnetic. Select one: a. Always b. Rarely c. Sometimes d. NeverAn electric motor uses an electromagnet to change _____. Select one: a. mechanical energy to electrical energy. b. magnetic fields in the motor. c. magnetic poles in the motor. d. electrical energy to mechanical energy.How do you make an electromagnet? Select one: a. Line up the N and S poles of a magnet with an electric wire b. Wrap a magnet around a piece of wire with current flowing through it c. Run current through a wire wrapped around an iron rod d. Wrap a piece of wire around iron rod looping the wire over 20 times. Cutting a bar magnet in half will result in Select one: a. one magnet with a north pole only, and one magnet with a south pole only b. two unmagnetized bars c. two smaller magnets, each with a north pole and a south pole d. two magnets with a north pole onlyWhat happens to the magnetic force as the distance between two magnetic poles increases? Select one: a. remains constant b. decreases c. increases d. alternates between increasing and decreasingIf the poles of two magnets repel each other. Select one: a. both poles must be south poles b. both poles must be north poles c. one pole is a south pole and the other is a north pole d. the poles are the same typeIn a generator, the current is produce when the mechanical energy of the motor is transferred to ____________. Select one: a. electrical energy b. magnetic energy c. not possible d. chemical energyWhat happens when you turn off the current in an electromagnet? Select one: a. The magnetism is turned off b. The current keeps flowing because of the magnetic force c. The electromagnet reverses its polarity d. The iron core slowly looses the magnetism that it has built up