Term Exam #1, version B Part I: Multiple Choice Questions (pts. each); no partia

Question

Term Exam #1, version B Part I: Multiple Choice Questions (pts. each); no partial credit will be given. 1. A sketch of the field lines is shown in the Figure 1. Ifi is a negative charge, determine the signs of other charges. N/A (A) 2 and 3 are positive charges and 4 is negative D) all other charges are positive as well (E) all other charges are negative Figure 1 For questions 2-4 consider the electric field described by the field lines shown in the Figure 2. The force Fon a positive charge Q placed at position o is shown. 2. At what point, A, B, C, or D, is the magnitude of the electric force on the charge Q greater than the magnitude of the force F? 3. At what point, A, B, C, or D, is the magnitude of the electric force on the charge Q equals the magnitude of the force F? Figure 2 4. If a negative charge 2Q is placed at point o instead of the positive charge Q, what would be the force on the 20 charge? (B) F (C02F (A) F PHYS 2426-University Physics II B

Explanation / Answer

Part1

oprtion B is correct. ( The magnetic field lines originates from positive charges and terminate into negative charge.Here in this case magnetic field originates from positive charges 3, 4 and terminate into I, while lines from 2 doesnot terminates into I. Hence 2 is negative)

Part2

At point C the force will be greater because it is close to the source charge)

Part 3

At point A the force will be of same magnitude because it is at same distance from the source of magneric field.

Part 4

D) -2F will be the correct option becasue in case of negative charge force will be attractive and also will be in negative direction of F. By doubling magnitude of charge to 2Q force will also be double that is -2F.

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