Magnetism Wire Loop: Solve Problem in 1.5 Hours

[ellatha]

Okay guys I have an hour and thirty minutes before my exam; I know how to do the top problem; just use the formula B = mew x current/(2 x pi x r) then add the magnetic fields and use the right-hand rule to get direction, but I'm stuck on the bottom one.

 

[Hesch]

Lenz's law states, that an induced current in the inner loop will try to prevent a change of flux through the inner loop, induced by the out loop.

 

[rude man]

Okay guys I have an hour and thirty minutes before my exam; I know how to do the top problem; just use the formula B = mew x current/(2 x pi x r) then add the magnetic fields and use the right-hand rule to get direction, but I'm stuck on the bottom one.

In prob. 5 P is shown at (0.1,0) not at (0,0.1).
In prob. 6, remember Lenz's law?