Quiz (See related pages) 1 It is necessary that a charge be placed at a point to have an electric field at that point. A) True B) False 2 Electric field lines never intersect. A) True B) False 3 Gauss’s law represents a statement of equality, but it will not withstand unit analysis. A) True B) False 4 The direction of the electric field at a given point A in the vicinity of a positive charge depends on the sign of a charge placed at point A. A) True B) False 5 The field in the vicinity of a number of charges is equal to the algebraic sum of the fields due to the individual charges. A) True B) False 6 The spacing of electric field lines is such that they are close together when the field is strong and far apart when the field is weak. A) True B) False 7 Gauss’s law demonstrates that all the charge lies on the surface of a conductor. A) True B) False 8 Because of the way in which an electric field is defined, the direction of the electric field and the force on a test positive charge will always be the same. A) True B) False 9 The electric field intensity at the midpoint of a line joining identical charges will always be zero. A) True B) False 10 At a point twice as far away from a certain charge, the field intensity will be reduced by one-fourth. A) True B) False 11 The electric field intensity is zero A) midway between two equal charges of like sign B) midway between two charges of unlike sign C) at any point equal distances from two identical charges D) between two equal but oppositely charged plates 12 The direction of the electric field intensity is A) away from all negative charges B) toward all negative charges C) the same as the direction of an electric force D) dependent on the nature of a charge placed at the point in question 13 The magnitude of the electric field does not depend on the A) distance from charged objects B) sign of the charges causing the field C) magnitude of the charges causing the field D) force a unit positive charge will experience 14 The spacing of electric field lines between two identical point charges of opposite sign is A) not dependent on the magnitude of the charges B) an indication of the field direction C) an indication of the field strength D) large when the charges are large 15 According to Gauss’s law, the number of electric field lines crossing any closed surface is A) numerically equal to the enclosed charge B) equal to the enclosed positive charge C) equal to the electric field inside the surface D) equal to the charge density on the surface 16 The permittivity of a medium A) is a measure of its density B) is equal to unity for air or a vacuum C) is dependent on the charge density of the medium D) determines the magnitude of an electric field that can be established by the medium 17 The electric field intensity at a distance of 4 m from a 6-µC charge is A) 1.69 X 10³ N/C B) 3.38 X10³ C) 1.35 X 104 N/C D) 2 X 104 N/C 18 The electric field intensity between two oppositely charged plates is 4 X 105 N/C in a downward direction. The force on a -2-nC charge passing between the A) 2 X 104 N upward B) 2 X 104 downward C) 8 X 10S-4 N upward D) 8 X 10-4 N downward 19 Two point charges of -4 and -6 µC are 10 cm apart in air. The magnitude of the electric field midway between the two charges is approximately A) 7.2 X 106 N/C B) 3.6 X 107 N/C C) 1.8 X 106 N/C D) 3.6 X 105 N/C 20 An 8-µC charge is 12 cm to the right of a -5- µC charge. The magnitude of the electric field at a point 9 cm above the 8- µC charge is approximately A) 3.72 MN/C B) 5 MN/C C) 6.4 MN/C D) 7.85 MN/C 21 An electric field is said to exist in a region of space in which a(n) will experience a(n) . 22 The direction of the at a point in space is the same as the direction in which a(n) would move if it were placed at that point. 23 The electric field intensity near a known charge is directly proportional to the and inversely proportional to the . 24 When more than one charge contributes to a field, the resultant field at a point is the of the fields due to each charge. 25 The spacing of electric field lines must be such that they are where the field is weak and where the field is strong. 26 are imaginary lines drawn so that their direction at any point is the same as the direction of the at that point. 27 The direction of an electric field is a positive charge and is a negative charge. 28 The total number of lines passing normally through a surface is numerically equal to the contained within the surface. This is known as . 29 It can be shown from that all charge resides on the of a conductor. 30 The units of the proportionality constant k used in calculating the electric field intensity are .
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