Question $1$

Two charged spheres are placed as shown above. The size of the sphere represents how much charge it has. Choose the position $($indicated by A$,$ B$,$ or

C$)$ where there would be zero electric field.

A

B

C

Question $2$

A surface charge density of $2\mathrm{.}10{10}^{-9}\frac{C}{c}{m}^2$ exists on a circle$-$shaped disc. If the disc's radius increases by a factor of $2($but the total charge stays $t$

same$),$ what is the surface charge density?

The surface charge density remains the same.

$5\mathrm{.}25{10}^{-10}\frac{C}{c}{m}^2$

$4\mathrm{.}20{10}^{-9}\frac{C}{c}{m}^2$

$1\mathrm{.}05{10}^{-9}\frac{C}{c}{m}^2$