Explanation:
The given data is as follows.
Electric field between plates without dielectric, 
Electric field between the plates with dielectric,
.
Permittivity of free space,
= 
Now, we will determine the charge density as follows.

= 
= 
Thus, we can conclude that the charge density on each surface of the dielectric is
.
Answer:
OPTION A, Kelvin Thermometer is Incorrect
Explanation:
Now, if you consider best two out of three results, then celsius and Fahrenheit thermometers read the same value, meaning both are right.
1) K = °C + 273
K = 100°C + 273
k = 373°C
Kelvin Thermometer is Incorrect
2) 
when we have 212°F

which is correct
Answer:
Explanation:
Given
Each student exert a force of 
Let mass of car be m
there are 18 students who lifts the car
Total force by 18 students 
therefore weight of car 
mass of car 

(b)
Answer:
It's the 3rd option
Explanation:
Wind is caused by the differences in air pressure on Earth's surface.