9-11 please Question #9: Three particles with identical amounts of positive char

Question

9-11 please

Question #9: Three particles with identical amounts of positive charge are arranged along a straight line. The two on the ends are both 0.2 meter from the center particle. If the configuration energy of this arrangement is 45 Joules, what is the charge or each particle? Question #10: Consider a parallel plate capacitor with circular plates. If the radius of each plate is doubled and the distance separating the plates is halved, how does the capacitance change? a. The capacitance is halved. b. The capacitance doubles. c. The capacitance quadruples. d. The capacitance remains unchanged. e. None of the above is correct. Question #11: An imaginary double pyramid (also known as an octahedron) encloses a small charged particle. The particle is located at the center of the octahedron. See the figure below. The charge on the particle is +5.31 nC. Calculate the electrie flux through any one of the outer faces of the octahedron. Answer to thre figures. Hint: This is a physics problem not a geometry problem. e significant

Explanation / Answer

9)Since charge on all particle is same.

Total potential energy of system=kqq/(0.2)+kqq/(0.2)+kqq/(0.4)=12.5kqq=12.5*9*10^9 * q^2 =45

q=0.2*10^{-4} C

11)Since the octahedron has 8 faces. The flux through each face will be same.

We know total Flux=q/esilon_0

Flux through any aone face=q/6*esilon_0 = 5.31nC / 6*8.85*10^{-12}=100 Wb

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