Author Question: If a current of 2.4 A is flowing in a cylindrical wire of diameter 2.0 mm, what is the average ... (Read 125 times)

abern · **on:** Jul 29, 2018

If a current of 2.4 A is flowing in a cylindrical wire of diameter 2.0 mm, what is the average current density in this wire?

A) 7.6 105 A/m2
B) 5.2 10-6 A/m2
C) 1.9 105 A/m2
D) 3.6 105 A/m2
E) 21 10-6 A/m2

Question 2

A negative charge, if free, will tend to move

A) from high potential to low potential.
B) from low potential to high potential.
C) toward infinity.
D) away from infinity.
E) in the direction of the electric field.