Answer:
10
Explanation:
Original expression:
Let's simplify it step-by-step:
(removing the parentheses)
(adding together similar terms in x)
(adding together similar terms in y)
(adding together similar terms with no variable)
So, from the final expression, we see that the coefficient for y is 10.
Potential at a point near a charge = Q / 4πε₀ R
where Q is charge given , R is distance of point from the charge .
Q / 4πε₀ R = 40
Electric field E at A = -dV / dR
= .16 x 10⁻³ / 2 x 10⁻⁶
= .08 x 10³
= 80 N/C
E = Q / 4πε₀ R²
80 = Q / 4πε₀ R x R
80 = 40 / R
R = 40 / 80
= .5 m .
thxs ace