I\'m having trouble with these two related problems, could you please highlight

Question

I'm having trouble with these two related problems, could you please highlight or clearly mark the answers to each question as well as give a detailed explanation for how you got there. Thanks in advance.

HW-3 ch-19 Problem 19.22 previous | 1 of 5 | next Press F11 to exit full screen Problem 19.22 Part A A sphere of radius 4.98 cm and uniform surface charge density +12.4 C/m2 exerts an electrostatic force of magnitude 4.34 10-2 N on a point charge +1.25 uC Find the separation between the point charge and the center of the sphere r395 Submit My Answers Glive Up Incorrect; Try Again; 17 attempts remaining Continue

Explanation / Answer

I am solving first question in detail.Please post the second question as a separate question

Answer 1

given force=4.34*10^(-2)

we know force between sphere and point charge =K*Q*q/r^2 where Q is charge of sphere

where r is the distance between center of sphere and point charge

Q =surface density*surface area=12.4*10^(-6)*4*pi*(0.0498)^2=3.86*10^(-7) C

we got

r^2=K*Q*q/force

r^2=0.1001

r=0.316 m

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