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# A solid conducting sphere of radius 2.00 $\mathrm{cm}$ has a charge of 8.00$\mu \mathrm{C}$ . A conducting spherical shell of inner radius 4.00 $\mathrm{cm}$ and outcr radius 5.00 $\mathrm{cm}$ is concentric with the solid sphere and has a charge of $-4.00 \mu \mathrm{C}$ . Find the clectric ficld at(a) $r=1.00 \mathrm{cm},(\mathrm{b}) r=3.00 \mathrm{cm},(\mathrm{c}) r=4.50 \mathrm{cm},$ and $(\mathrm{d}) r=$ 7.00 $\mathrm{cm}$ from the center of this charge configuration.

## A. electric field is zero $(E=0)$B. $7.9888 \times 10^{7} \mathrm{N} / \mathrm{C}$C. electric field is zeroD. $7.34 \times 10^{6} \mathrm{N} / \mathrm{C}$

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### Video Transcript

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Wesleyan University