Find the net electric field at point A, produced by changes q_1 and q_2 in terms

Question

Find the net electric field at point A, produced by changes q_1 and q_2 in terms of k, q and d. Which of the answers below is correct? A) 5kd^2 N?C b) 2.4 k/d N/C c) 0 N/C An electron is released in an area of space occupied by an electric field. Which of the following statements is correct? a) The electron will experience a force in the same direction as the electric field electron c) The electron will experience a force in the opposite direction of the electric field c) The net force on the electron is zero 20) A conducting shpere of uniformly-distrubted charge + Q is sitting in free space. Which of the following is correct? a) there is a non zero electricfield inside the sphere b) The electric field inside the sphere is zero c) The electric field outside the sphere is constant and indepdent of distance from the sphere Which of the following stamtens is correct? a. Electric field of a plane of charge is constant, and independent of distance from the plane Electric field of line of charge is independent of distance from the line of charge c) Both and b A coulomb is the same as: a) an ampere/second b) half an ampere .second^2 c) an ampere second e) a newton .meter^2 Suppose we have two capacitors C1 with charge Q1 and C2 with charge Q2 that are connected in parallel, which of the following statements is correct? a) The equivalent capacitance is the sum of each capacitance added b) The equivalent capacitance is the inverse sum of each capacitance c) The electric potential drop across each capacitance is different than that provided by the battery For the diagram below, what is the total equivalent capacitance? a) 1 mu F b) 0.30 mu F c) 0.8 mu F

Explanation / Answer

(18) E = k (4q) / d^2 - k(16q) / (d + d)^2

= 4 k q / d^2 - 4 k q / d^2

= 0

Ans(c)

(19) F = q E

for electron , q is negative.
(B) experience force in the opposite direction of electric field

(20) for conducting sphere, charge lies on surface only.

so Qin = 0

E = 0

Ans(b)

21. for plane, E = sigma / 2e0

for line, E = 2 k lambda / r

Ans(c)

22. Q = I t = A . s

Ans(d)

23. Ceq = C1 + C2 for parallel

  
(A)

24. C1, C2 and C3 are in parallel.

Ceq = C1 + C2 + C3 = 0.3 + 0.3 + 0.2 = 0.8 uF

Ans(c)

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