A copper wire has a square cross section 2.1 mm on a side. The wire is 4.3 m long and carries a current of 3.6 A. The density of
free electrons is 8.5 * 1028>m3 . Find the magnitudes of (a) the current density in the wire and (b) the electric field in the wire. (c) How much time is required for an electron to travel the length of the wire?
1 answer:
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Answer:
The magnitude of electric force on object B due to object A when they are 2r distance apart is F/4.
Explanation:
Given :
Electric charge on object A = +Q
Electric charge on object B = +4Q
When the objects A and B are r distance apart, the magnitude of electrostatic force exerted on B due to A is given by the relation :
.....(1)
Now, the two objects are apart by distance of 2r, hence the force acting on the object B due to A is :
Substitute equation (1) in the above equation.
Answer:
2726.54 J/K
Explanation:
Entropy change =
where
m = mass of water = 450g = 0.45kg
= 2.26 MJ/kg = 2260000 J/kg
T = temperature at which water change from liquid to steam = 100 degree Celsius = 272 + 100 = 373 degree kelvin.
Entropy change = = 2726.54 J/K