What Are the Answers to These Magnetism Questions?

[Sunturday]

Homework Statement

Please see attachments.

Homework Equations

F=ILB

The Attempt at a Solution

F1 - F2 = FT = 5*10^-5
Second one no clue.

 

[Sunturday]

And why is the current in this one clockwise as viewed from the top?

 

[siddharth23]

I think the answer to qn 4 is the current in the loop will flow in such a direction that the magnetic field produced by it will oppose the magnetic field of the magnet (law of conservation of energy). Hence, clockwise.

 

[siddharth23]

For the first one, the current will flow in such a direction that the magnetic field produced by that current will oppose the motion of the loop to the right by applying a force to the left
F=ILB

 

[Sunturday]

For the first one, the current will flow in such a direction that the magnetic field produced by that current will oppose the motion of the loop to the right by applying a force to the left
F=ILB

But inside the loop the magnetic field would be the other way.

 

[siddharth23]

Yup. Basically it tries to stay in it's original state of rest and oppose change.