Question
Select the best answer to make each statement true, and place the letter of the answer in the space provided.Flux density is an indication of_____a. repulsion.d. field strength.b. an electromagnet.e. a temporary magnet.c. a permanent magnet.
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16. Magnetic lines that are close to each other are said to have a high A) reluctance B) current C) flux density D) inductance. 17. The term reluctance in magnetic circuits is like the term in electrical circuits A) capacitance B) current C) resistance D) voltage. 18. A tesla is a unit of A) magnetic flux density B) reluctance C) permeability D) magnetomotive force. 19. A weber is a unit of A) permeability B) magnetomotive force C) magnetic flux D) reluctance. 20. The voltage produced by a magnetic field cutting through a conductor depends on the A) length of the conductor B) direction of motion C) speed of motion D) all of the above. 21. Reversing the current through an electromagnet the magnetic field. A) decreases B) collapses C) reverses D) increases. 22. If the number of turns of wire on an electromagnet increases, the magnetomotive force mmf A) decreases B) increases C) remains the same. 23. Increasing the speed at which a magnet moves through a coil of wire causes the induced voltage to A) remain the same B) decrease C) increase. 24. If some turns of wire are removed from an electromagnet, the magnetic field will A) be less than the original electromagnet B) be the same as the original electromagnet C) be more than the original electromagnet. 25. Like magnetic poles A) attract each other B) have no effect on each other C) repel each other D) have the same current through them. 26. The principal difference between a solenoid and a relay is that: A) relays relay electricity, solenoids do not. B) relays use magnets, solenoids do not. C) solenoids do electrical work, relays do mechanical work. D) solenoids do mechanical work, relays do electrical work. 27. The movable part of the solenoid is the: A) electromagnetic coil B) magnetic field. C) the plunger. D) all of these.
Do not use a calculator. To simplify numerical calculations, use $g=10 \mathrm{m} / \mathrm{s}^{2}$ Directions: In this section of the exam, the same lettered choices are used to answer several questions. Each group of questions is preceded by five lettered choices. When answering questions in each group, select the best answer from the available choices and fill in the corresponding bubble on the answer sheet. Each possible answer may be used once, more than once, or not at all. (A) Electric field (B) Electric force (C) Electric potential (D) Electric potential energy (E) Capacitance A vector quantity representing the alteration of space surrounding point charges and charged objects, which is associated with electric force.
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