Question

The X in the center of the below image is showing the direction of the current in the wire (into page).

K

1. In Part 1, use the direction of the compass needles and the right hand rule to determine whether the current in the wire is going up or down.

2. When the direct current is 2.00 A in a single wire of the bundle of 10 wires, the total current in the bundle of wire that approximates the long straight wire is 20.0 A. What is the magnitude of the B field 3.00 cm from this long straight wire carrying a current of 20.0 A? What is the magnitude of the B field 9.00 cm from the wire carrying 20.0 A?

3. A constant current is in a long straight wire in the plane of the paper in the direction shown in the image below by the arrow. Point X is in the plane of the paper above the wire, and point Y is in the plane of the paper but below the wire. What is the direction of the B field at point X? What is the direction of the B field at point Y?

* X

-------------->

* Y

Answer 1