Practice_Test_4_with_Solutions

# Practice_Test_4_with_Solutions - Solutions to Practice Test...

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Solutions to Practice Test 4 1. Choose from the following the statement(s) that is/are true (i) A magnet attracts all types of materials. (ii) A magnetic material can be made into a magnet. (iii) Only iron and steel get attracted by a magnet. (iv) A material that can be made into a magnet is called a magnetic material Answer: d (ii) and (iv) only 2. Select the statement(s) that is are NOT true of magnetic poles. (i) The force between magnetic poles is directly proportional to the product of their pole strengths and inversely proportional to the square of the distance between them. (ii) The north pole of a freely suspended magnet will point north while coming to rest. (iii) A magnetic material is made up of magnetic monopoles. (iv) When a magnetic material is brought near a magnet, polarization of magnetic monopoles will take place inside the magnetic material temporarily making it a magnet. Answer: a (iii) and (iv) only. Remember, there are no free magnetic monopoles 3. Choose the statement(s) that is/are true of a magnetic field. (i) Magnetic field is a three dimensional space around a magnet where it attract other materials. (ii) Magnetic field is a vector quantity that has a magnitude and direction. (iii) The strength of a magnetic field at a point depends on the distance of the point from a magnetic pole. (iv) The SI unit for magnetic field is the gauss (G) Answer: c (ii) and (iii) only 4. Choose the correct statement(s) about the unit of magnetic field (i) The SI unit for magnetic field is the tesla which is NA -1 m -1

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(ii) The SI unit of magnetic field is the tesla which NC -1 (iii) The gauss is a commonly used unit for measuring magnetic field. (iv) The tesla and the gauss are both SI units for measuring magnetic field. Answer: b (i) and (iii) only. Gauss is not an SI unit 5. Which of the following is the correct relationship between the tesla (T) and the gauss (G)? (a) 1 T = 10 -4 G (b) 1 G = 10 4 T (c) 1 T = 10 4 G (d) 1 G = 10 -6 T Answer: c 6. The figure shows a wire on the plane of the paper carrying a current. What is the direction of the magnetic field produced by this current on the right side of the wire? a. into the plane of the paper. b. out of the plane of the paper. c. in the plane of the paper directed up. d. in the plane of the paper directed down. Answer: a Keeping your thumb pointing in the direction of the current, if you warp the other four fingers of your right hand on the wire, your fingers will go into the paper on the right side of the wire and out of the paper on the left side. 7. Choose the statement(s) that is /are true of magnetic flux. (i) Magnetic flux is a measure of the number of lines of force crossing at right angles to unit area of a surface. (ii) Magnetic flux is measured in Wb.m -2
(iii) Magnetic flux is magnetic field per unit area. (iv) Magnetic flux through a given surface is the product of the magnetic filed at right angles to the surface and the area of the surface.

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## This note was uploaded on 05/01/2011 for the course PHY 2049 taught by Professor George during the Spring '11 term at Edison State College.

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Practice_Test_4_with_Solutions - Solutions to Practice Test...

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