Answer:
Thermocouple, also called thermal junction, thermoelectric thermometer, or thermel, a temperature-measuring device consisting of two wires of different metals joined at each end. One junction is placed where the temperature is to be measured, and the other is kept at a constant lower temperature.
The relationship between the resistance R of a wire and its resistivity

is given by

where L is the length of the wire and A is its cross sectional area.
In the problem, we have

,

and

. So we can solve the find the area A:

For a cylindrical wire, the cross sectional area is given by

where r is the radius. We know the value of the area A, so now we can find the radius of the wire:
C)Electric Charges Produce Electric Fields
Answer
0.001339 liter
Explanation:
It is given that radius = 4 cm =0.04 m
volume of sphere 

It is given that hose delivers five liters per minute
So the water flows through sphere per minute is given by 5×2.674×
=0.001339 liters