Author Question: A very long straight wire carries a 12-A current eastward and a second very long straight wire ... (Read 159 times)

CQXA · **on:** Jul 29, 2018

A very long straight wire carries a 12-A current eastward and a second very long straight wire carries a 14-A current westward. The wires are parallel to each other and are 42 cm apart. Calculate the force on a 6.4 m length of one of the wires.

(0 = 4 10-7 T m/A)
A) 5.1 10-4 N
B) 2.2 10-4 N
C) 5.1 10-6 N
D) 8.0 10-5 N
E) 8.0 10-7 N

Question 2

What is the minimum magnitude of an electric field that balances the weight of a plastic sphere of mass 6.4 g that has been charged to -3.0 nC?

A) 2.1 107 N/C
B) 2.4 106 N/C
C) 4.5 106 N/C
D) 6.4 106 N/C