• C E • A • B Choose the correct statement below about the uniform electric field shown above. The electrostatic force on a charge is weaker at point B than at point A The electrostatic force on a charge is greater at point B than at point C The electrostatic force on a charge is greater at point A than at point C The electrostatic force on a charge is greater at point A than at point B OThe electrostatic force on a charge is the same at points A and C

Two point charges are placed on the x axis. (Figure 1)The first charge, q = 8.00 nC, is placed a distance 16.0 m from the origin along the positive x axis; the second charge, 92 = 6.00 nC , is placed a distance 9.00 m from the origin along the negative x axis. Calculate the electric field at point A, located at coordinates (0 m, 12.0 m ). Give the x and y components of the electric field as an ordered pair. Express your answer in newtons per coulomb to three significant figures. • View Available Hint(s) EAz, EAy = 0,0.300 N/C Submit Previous Answers v Correct igure < 1 of 1 Part B An unknown additional charge q3 is now placed at point B, located at coordinates (0 m, 15.0 m ). Find the magnitude and sign of q3 needed to make the total electric field at point A equal to zero. В (0 m, 15 m) А (0 m, 12 m) Express your answer in nanocoulombs to three significant figures. • View Available Hint(s) O (0 m, 0 m) 92 (-9 m, 0 m) 91 (+ 16 m, 0 m) ΠνΠ ΑΣφ 93 = nC

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A pair of unlike charges equal in magnitude and separated by a small distance is known as a dipole. Such a pair is situated on the x axis at equal distances from the origin as shown in the figure below. Use the direction rosette to answer the questions. ΧΑ 8 + * D E B 3 +q -9 5 9 zero magnitude (a) What is the direction of the net electric field at location C due to both charges? 5 X Did you consider the symmetry of the situation? What is the net contribution to the field from the y components of the field from each charge? (b) What is the direction of the net electric field at location D due to both charges? ---Select--- v (c) What is the direction of the net electric field at location E due to both charges? ---Select--- ✓ Additional Materials Reading 7

Three point charges are located on the positive x-axis of a coordinate system Charge g = 15 nC as 20 cm from the origin, charge 40 nC is 4.0 cm from the origin and charge q = 60 nC located at the ongin For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Vector addition of electric forces on a line 4 Y Part A What is the magnitude of the net force exerted by the other two charges on charge g150 Express your answer in newtons ΑΣΦ 1- Submit Part B 0= Request Answer Submit What is the direction of the net force exerted by the other two charges on charge 15 aC Express your answer in degrees. ΘΕΙ ΑΣΦΑ ? Request Answer N ? counterclockwise from the direction

How many of the following statements about the electrostatic force (Coulomb's Law) are true? • The strength of the electrostatic force between two charges increases with the square of the distance between them • The strength of the electrostatic force between two charges decreases with the masses of the two charges • The strength of the electrostatic force between two charges is zero in vacuum • The charges must be in motion to experience an electrostatic force Two statements only O Three statements only One statement only O No statement is true All four statements