Calculate the magnitude of the electric field 9.25 cm from the center of the sphere. Answer in units of N/C.

Explanation:

For a solid sphere; r > R

E = Q/4πεor^2

r = 9.25 cm = 0.0925m

plugging the values into the formula ;

Volume within sphere of radius 9.25 cm = 4/3π X (0.0925 m)^3

Charge per unit volume = 21.2/[4/3π X (0.0925m)^3] µC

= 6.39µC

By Coulomb's law,

the electric field = 9 X 10^9 X 6.39 X 10^-6/( 0.0925)^2

= 9 X 10^9 X 6.39 X 10^-6/0.0925^2

= 672.14KN/C

the assestment will probley apele with cause and effect

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.