The use of cellphones and other Wi-Fi devices will NOT be allowed during the exa
ID: 1870759 • Letter: T
Question
The use of cellphones and other Wi-Fi devices will NOT be allowed during the exam. You will NoT to leave the testing area once you start the exam Part 1: Multiple Choice (60 points) Choose the best answer from the choices given and write t on the space provided. the letter of your answer 1. Two point charges are 4 cm apart. They are moved to a new separation of 2 cm. resulting mutual force between them change? cm apart. They are moved to a new separation of 2 cm. By what factor does the A. 1/2 D. 4 2. A6.00 C charge is placed at the origin and a second charge is placed on the x axis at x-o300 m. If the g force on the second charge is 6.40 N in the positive x-direction, what is the force on the charge at the origin? A. 6.40 N in the positive x-direction B. 6.40 N in the negative x-direction C. ON D. not able to be determined until the second charge is known 3. The figure at right shows the sketch of the electric field lines for a pair of charges. Which of the following statement is TRUE about charge I and charge 27 A) Qi is negative and its magnitude is twice that of Qa B) Q, is positive and its magnitude is twice that of Q C) Qz is negative and its magnitude is twice that of Q D) Qi is positive and has the same charge as Q 4. A charge, +Q, is placed inside a balloon and the balloon is inflated. As the radius of the balloon r increases the net flux through the balloon surface A. increases proportional to , ncreases proportional to r C. stays the same. D. decreases as Lir.Explanation / Answer
1. F = k q1 q2 / r^2
hence F1 r1^2 = F2 r2^2
F (4 cm)^2 = Fnew (2 cm)^2
Fnew = 4 F
Ans(D)
2. force will be of same magnitude but in opposite direction.
Ans(B) 6.40 N in the negative direction
3. charge from lines starts is positive charge
and on which line exit is -ve charge.
ratio of lines from/on charge gives the ratio of magnitudes of charge.
Ans(B)
4. flux through closed surface depends only on enclosed charge.
and enclosed charge does not change.
Ans: (C) stays same.
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