Moving Charges ...

A proton of charge $$e$$ moving at speed $$v_0$$ is placed midway between two parallel wires a distance $$a$$ apart, each carrying current $$I$$ in opposite directions.
The force on the proton is:

A particle of charge $$q$$ and mass $$m$$ moves in a circular path of radius $$r$$ in a uniform magnetic field $$B$$.
The angular momentum of the particle can be described by the expression:

A particle of charge $$q$$ and mass $$m$$ is moving at a speed $$v$$ enters a uniform magnetic field of strength $$B$$ as shown below.
How much work is done by the magnetic field on the charge as the field accelerates the charge into a circle of radius $$r$$?

Two wires carrying current in opposite directions are placed a distance $$a$$ apart.
Which of the following will cause the greatest increase in the magnitude of the force between the wires?

Three wires $$A,B$$, and $$C$$ all are all parallel and have the same magnitude of current. Wires $$A$$ and $$B$$ have current going toward the top of the screen while wire $$C$$ has current going toward the bottom of the screen.
What is the direction of the force on $$A$$ because of the other two wires?

Two wires carrying equal current $$I$$ are a distance $$a$$ apart.
If the current through wire one is doubled while the current through the wire two is tripled, what is the ratio of the force that wire two exerts on wire 1 ($$F_1$$) to the force that wire one exerts on wire 2 ($$F_2$$)?

Two wires carrying equal current $$I$$ in opposite directions are placed a distance $$a$$ apart. The wires experience a force $$F$$ due to the current. The wires are moved to a distance $$\dfrac{a}{2}$$.
If the current in wire one remains the same, which of the following values of $$I_2$$ would result in the same force $$F$$ between the wires?

Two current carrying wires are a distance $$a$$ apart and experience a Force $$F$$ between them. The wires are moved a distance 2$$a$$ apart.
Which of the following is a possible value for the new force between the wires?

Two wires are pictured below, both carrying current toward the east.
What is the direction of the force exerted by wire $$2$$ on wire $$1$$?

A wire carrying a current of 4 A is in a 0.5 T magnetic field as shown above.
If the direction of electron flow is to the right as shown, what is the magnitude and direction of the force (per unit length) on the wire?