The diagram below shows a gray insulating sphere of charge 30 nC centered inside

Question

The diagram below shows a gray insulating sphere of charge 30 nC centered inside a black insulating spherical shell of charge - 25 nC. Assuming there are no other charges present, what is the electric potential in Volts a distance 20 cm away from the center of the gray sphere? Recall 1 n C = .000000001 C. - 5618.23. - 1123.75, 224.75, 1123.75 Masses A and B rest on two pistons which each cap a fluid in the figure below. There is no friction between the pistons and the cylinders in which they sit. Which of the following is true? mass A is greater than mass B, mass B is greater than mass A, the masses of A and B are equal

Explanation / Answer

5) C) 224.75 V

at the given point net potential,

Vnet = Vshell + Vsphere

= k*Qshell/r + k*Qsphere/r

= (k/r)*(Qshell + Qsphere)

= (8.989*10^9/0.2)*(30 - 25)*10^-9

= 224.75 N/c

6) b) mass B is greater than mass A

using pascal'a law

Pressure at both pistons is same

PA = PB

FA/A1 = FB/A2

FA/1 = FB/2

FB = 2*FA

== > mB = 2*mA

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