In this worksheet, we will practice calculating the magnetic force between two parallel current-carrying wires.

Q1:

Two long, straight wires are parallel and 10 cm apart.
One carries a current of 2.0 A, the other a current of 5.0 A.
What is the magnitude of the force per unit length between the wires?

A
N/m

B
N/m

C
N/m

D
N/m

E
N/m

Q2:

The two long parallel wires shown in the figure carry currents in the same direction. If A and A, where cm, what is the magnetic field at point ?

A
T

B
T

C
T

D
T

E
T

Q3:

The figure shows two long, straight, horizontal wires that are parallel and a distance apart, where
cm.
Both wires carry a current
A, but in opposite directions.

What is the magnitude of the magnetic field at
?

What is the magnitude of the magnetic field at

A
T

B
T

C
T

D
T

E
T

Q4:

Two long straight wires are parallel and 65 cm apart. If each wire carries a current of 80 A in the same direction, what is the magnetic force per unit length exerted on each wire?

A
N/m

B
N/m

C
N/m

D
N/m

E
N/m

Q5:

Two long parallel wires are hung by cords of length 4.00 cm, as shown in the figure. Each wire has a mass per unit length of 30.0 g/m and they carry the same current in opposite directions. What is the current if the cords are at a angle with respect to the vertical?

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