A solid sphere 21 cm in radius carries 17 C , distributed uniformly throughout i

Question

A solid sphere 21 cm in radius carries 17 C , distributed uniformly throughout its volume.

Part A Find the electric field strength 11 cm from the sphere's center. Express your answer using two significant figures.

E1=............MN/C  

Find the electric field strength 21 cm from the sphere's center.

Express your answer using two significant figures.

E2=............ MN/C  

Find the electric field strength 42 cm from the sphere's center.

Express your answer using two significant figures.

............

............

Explanation / Answer

(a)

Elelctric field of solid sphere when (r < R),

E1 = kqr / R^3

E1 = 9*10^9*17*10^(-6)*0.11 / (0.21)^3

E1 = 1.81*10^6 N/C

(b)

Elelctric field of solid sphere when (r = R),

E2 = kq / R^2

E2 = E = 9*10^9*17*10^(-6) / (0.21)^2

E2 = 3.46*10^6 N/C

(c)

Elelctric field of solid sphere when (r > R),

E3 = kq / r^2

E3 = 9*10^9*17*10^(-6) / (0.42)^2

E3 = 0.86*10^6 N/C

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