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A 2-?C point charge is embedded in the center of a solid Pyrex sphere of radius...

A 2-?C point charge is embedded in the center of a solid Pyrex sphere of radius R = 15 cm.

(a) Calculate the electric field strength E just beneath the surface of the sphere. Incorrect: Your answer is incorrect. N/C

(b) Assuming that there are no free charges, calculate the strength of the electric field just outside the surface of the sphere. Incorrect: Your answer is incorrect. N/C

(c) What is the induced surface charge density ?ind on the surface of the Pryex? Incorrect: Your answer is incorrect. C/m2

** Answer them in term of "e" like [ ex. : 1.43e+05? ]

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