# Homework Help: Can anyone give me an idea on these probs

1. Mar 4, 2005

### metz143

Hello. Our instructor gave us 2 sets of problems. Deadline is on monday. If anyone can share his / her idea, I would really appreciate it.

Here are the problems:
1. Two positive point charges q and q2 are moving relative to an observer at point P; P measures the forces on the charges.

a) What is the direction of the force that q2 exerts on q?
b) what is the direction of the force that q exerts on q2?
c) if V=V2= 3.00 x 10^6 m/s. What is the ratio of the magnitude
of the magnetic force that acts on each charge to that of the coulomb
force that acts on each charge?

2. A long straight wire lies along the y-axis and carries a current of 5.00A in the y-direction. In addition to the magnitude Bo with magnitude 1.75x10^-6 T is the +x direction. What is the total field(magnitude and direction) at the following points to the xz plane:
a) x=0 ; z=2.00m
b) x=2.00 m; z=0
c) x=0;z=0.50m

Any help would be very much appreciated.Thank you in advance.