Author Question: Two long parallel wires are a distance d apart. The current in one wire is 10 A and the current in ... (Read 175 times)

JGIBBSON · **on:** Jul 28, 2018

Two long parallel wires are a distance d apart. The current in one wire is 10 A and the current in the other wire is 30 A. The currents are in the same direction. If the 30-A current is increased to 50 A, by what factor does the magnitude of the magnetic field midway between the wires change?
a. 2
c. 25/9
b. 4
d. 5/3

Question 2

For a mass suspended on a spring in the vertical direction, the time for one complete oscillation will depend on:
a. the value for g (the acceleration due to gravity).
b. the distance the mass was originally pulled down.
c. the maximum speed of the oscillating mass.
d. the time doesn't depend on any of the above.