$1$

An electric field is vec$(E)=(400\frac{N}{C})hat(i)$ for $x>0$ and vec$(E)=(-400\frac{N}{C})hat(i)$ for A cylinder of length $30$ cm and radius $10$ cm has its center at the origin and its axis along the $x$ axis such that one end is at $x=+15cm$ and the other is at $x=-15cm.$ What is the net outward flux through the entire cylindrical surface?

zero

$2\mathrm{.}5kN*\frac{m^2}{C}$

$0\mathrm{.}50kN*\frac{m^2}{C}$

$25N*\frac{m^2}{C}$

$0\mathrm{.}25MN*\frac{m^2}{C}$

Two parallel metal plates $0\mathrm{.}35$ cm apart have a potential difference between them of $175$ V $.$ The electric force on a positive charge of $6\mathrm{.}4{10}^{-}{?}^{19}C$ at a point midway between the plates is approximately