The force of attraction is weaker if : A.the distance of separation is zero B.the distance of separation is less C.the distance of seperation is greater . D. The masses are greater

2. Q₁ = 0.35 µC at (0, 4, 0) m and Q₂ = -0.55 µC at (3, 0, 0) m a) Is Coulomb force on Q1 due to Q2 is repelling force or attracting force? Why? b) Is Coulomb force on Q1 due to Q2 pointing to Q2 or away from Q2? c) Find the unit vector of Coulomb force on Q1 due to Q2 d) Find Coulomb force (vector) on Q1 due to Q2 e) Find the E field (vector)at (0,4,0) due to Q2 f) Find the D field(vector) at (0,4,0) due to Q2 g) What is the total flux normal to the closed surface S that encloses Q1 and Q2? h) Assume Q1 and Q2 are put at the center of a sphere with radius 4m, what is the electric flux density D (vector) on the sphere?

16. Divergence of the function D çâr in spherical polar coordinates is %3D 4ar2 (a) Zero (b) 1 (c) 2 (d) 3 17. The dimension of µo€, is (a) L-2T² (b) L²T-2 (c) L-²T-2 (d) L²T²

please help in three parts

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2) The charge, and mass, of the proton are which of the following values? a) +1.6 x 1019 C, m = 1.67 x 10-27 kg; b) -1.6 x 1019C, 9.11 x 10³' kg; c) 0, 1.67 x 1027 kg; and d) 3.2 x 1019 C, m = 1.8 x 1030 kg. 3) A proton is placed in a uniform electric field of 2.75 x 103 N/C. Calculate the following: i) magnitude of the electric force exerted on the proton; i) the proton's resultant acceleration; and ii) the speed of the proton, 1 usec after being released in the field, assuming it starts from rest. Show all work for credit. a) F(p) = 4.4 x 10:16 N, a(p) = 2.75 x 10" m/s², v(p) = 2.75 x 10' m/s; b) F(p) = 20 x 1018 N, a(p) = 1.2 x 101º m/s², v(p) = 1.4 x 10ʻ m/s; c) F(p) = 8 x 1016 N, a(p) = 4.8 x 10" m/s², v(p) = 2.63 x 105 m/s; or d) F(p) = 120 x 1019 N, a(p) = 63 x 10° m/s², v(p) = 8 x 10³ m/s. %3D %3D %3D %3D

Coulomb’s law tells us that the electrostatic force between two charged objects can be calculated by: ?= ??1?2/?^2Where k is a constant with a value of 8.99x109 Nm2/C2; ?1 and ?2 are the charges of the two particles (1.602x10-19 C), and r is the distance between the two particles. The force is attractive if the charges of the two particles is opposite (one’s positive and one’s negative) and repulsive if the charges have the same charge (both positive or both negative). Calculate the electrostatic force on proton #1 from the other two protons.Will the gravitational force between the protons be attractive or repulsive? What about the electrostatic force? Which has the larger magnitude, the electrostatic force or the gravitational force? Can the electrostatic and gravitational forces alone create a stable Lithium nucleus?

2. There 9₁ = que two point charges : = +15.54 ( at (0,0) & C moving at V₁ = 75.2 m/s T 92 = -21.24 C at (4.00 cm, 0) & moving at √ ₂ = 68.9 m/s 3 Find the electric & magnetic fields (in un't vector vector notation) (4.00 cm, 4.00 cm). at

13. Given an electron and a proton aligned horizontally like this:  -   + and separated by a distance of 35 nm. In which direction will the electron accelerate?   a. right   b. up

3. Each small sphere shown has a charge of magnitude q but the stationary charge in the center is negative while the two moving charges are positive. The moving charges (each of mass 0.20 kg) are attached to the ends of 4.0 m long strings and they are moving like conical pendulums as shown at a constant velocity of 12.0 m/s in uniform circular motion. The strings each make an angle of 30° to the vertical. Find the magnitude of the charge q. 300: 30° 4.0 m 4.0 m + q - 9 +q