Question

In: Physics

Three parallel wires, each carrying a current I (left and right wire carry upward current and...

Three parallel wires, each carrying a current I (left and right wire carry upward current and middle wire carries downward current....but all wires have the same magnitude current). Four points are identified on the picture as well.   What are the directions of the magnetic fields at the four points, starting with point 1, then 2, etc.

1

Question options:

1: in, 2: in, 3: out, 4: out

1: in, 2: out, 3: out, 4: in

none of these

1: out, 2: in, 3: out, 4: in

1: out, 2: in, 3: in, 4: out

Question

A wire is wrapped around a cardboard tube and carries a steady current in the direction shown (up in front, down in back).   If an observer were inside the tube, near the center, which direction would the observer expect to experience the magnetic field?

Question options:

pointing into the picture

none of these

pointing to the left

pointing to the right

pointing out of the picture

Question

Two concentric circular loops of wire each carry current I. The smaller loop has a clockwise current, while the larger loop carries a counterclockwise current. Point P is located at the center of both circles. What is the direction of the magnetic field at point P?

Question options:

out of the picture

there's no field, because the two contributions cancel

straight upward

into the picture

straight downward

Question

How far apart must two parallel wires be if they both carry I = 24 A and have a force per unit length of interaction between them of 4.4 x 10^-3 N/m?

Question options:

2.6 cm

3.9 cm

1.3 cm

26 cm

13 cm

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