Name Mh 27 // StudentlDr..595e87 Student ID Te8545 Phys 238- Sect. 2 1-Exam (Fal
ID: 1584400 • Letter: N
Question
Name Mh 27 // StudentlDr..595e87 Student ID Te8545 Phys 238- Sect. 2 1-Exam (Fall, 2017) To get credit for your answer to problems marked by an asterisk ) you must show ALL the work that led to the answer you chose or explain the answer! Ifyou need additional space se the back of the page. This is a closed-book, but one-index card exam and yow have appraximately 55 mimutes to complete it. If' you have questions, please ralse your hand "A charge of+2C is at the origin. When charge Q is placed at 2 m along the positive x-axis, the electric field at 2 m value of Q? negative x-axis becomes zero. What is the 2m 2m .8 C +2 C 2. Two point charges, one +4 and the other -g. form a dipole separated by a distance d. A third charge Q is placed midway between these two charges. If the distance between the +q and the i between the other two, what happens to the force on Q? naIi halves It reduces by a factor of s It stays the same. d. It quarters ' 3 "What is the equivalent capacitane ofthe contention shown? , 20pF 10 pF C. 40 F d. 25 pF 12uF 4 °1r an electron is accelerated from rest find its approximate velocity at the posential difference of 1800 v. end t his 5.210s d 6.3x10' msExplanation / Answer
Given that Electric field at x = -2 m is zero
Electric field due to 2C and Field due to Q = 0
E1+E2 = 0
(-ke*2/r1^2)+(ke*Q/4^2) = 0
(2/2^2)+(Q/4^2) = 0
Q = -8 C
so correct choice is 4) -8C
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.