surface is replaced by spherical surface?

same as through the sphitions

$($A$)$ under all conditions are of length $2R$

$($E$)$ under no conditions

$($B$)$ if the sides of the cube cube are of length $2R$

$($C$)$ if the diagonals of $+12\mathrm{.}2C.$

How many electrons must be added to the metal sphere to make

$6.$ A metal sphere has an excess charg

it electrically neutral?

$($A$)1\mathrm{.}39{10}^{14}($B$)1\mathrm{.}67{10}^{19}$

$($C$)3\mathrm{.}2{10}^{-6}$

$($D$)7\mathrm{.}6{10}^{13}$

$7.$ Consider the electric field lines shown in the drawing. Which one of the following statements concerning this situation is true?

$($A$)$ A and B are both positively charged.

$($B$)$ A and B are both negatively charged.

$($C$)A$ is a positively charged particle and $B$ is negatively charged.

$($D$)B$ is a positively charged particle and $A$ is negatively charged.

$8.$ Two objects separated by a distance $r$ are each carrying a charge $+q.$ The magnitude of the force exerted on second object by the first is $F=2N.$ If the first object is removed and replaced with an identical object that carries a char $($A$)8N$

$($b$)4N$

$($c$)2N$

$($D$)1N$

$($E$)0\mathrm{.}5N$