An air-filled parallel plate capacitor originally has a capacitance of Corig . The capacitor is then connect to a power supply and fully charged. While still connected to the power supply, a dielectric material with a dielectric constant of k is introduced between the plates of the capacitor. How does the charge on the dielectric-filled capacitor, Qnew compare to the original charge (ie. what is the ratio, Qnew/Qorig)

a. 1/k^2
b. K
c. 1, Qnew = Qorig
d. 1/k
e. K^2

more than, less

less than, more

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.