Use the figure. The dot means current comes out of the page toward you. What direction is the magnetic field at point Q to the right of the wire?

Use the figure. The dot means current comes out of the page toward you. At point P above the wire, which way does the magnetic field point?

Use the figure. The dot means current comes out of the page toward you. At point R below the wire, which direction is the magnetic field?

Use the figure. The dot means current comes out of the page toward you. At point S to the left of the wire, what is the magnetic field direction?

Use the figure. The cross means current goes into the page away from you. At point Q to the right of the wire, which way does the magnetic field point?

Use the figure. The cross means current goes into the page away from you. At point P above the wire, what direction is the magnetic field?

Use the figure. The cross means current goes into the page away from you. At point R below the wire, which direction is the magnetic field?

Use the figure. The cross means current goes into the page away from you. At point S to the left of the wire, which way is the magnetic field?

Use the figure. The dot means current comes out of the page toward you. At point A in the upper right, what is the magnetic field direction?

Use the figure. The cross means current goes into the page away from you. At point B in the lower left, what is the magnetic field direction?

Use the figure. The dot means current comes out of the page toward you, and a compass north end points along the field. At point P above the wire, which way does the north end point?

Use the figure. The cross means current goes into the page away from you, and a compass north end points along the field. At point S left of the wire, which way does it point?

Use the figure. The dot means current comes out of the page toward you. Which marked compass would show the larger deflection from Earth's field?

Use the figure. The cross means current goes into the page away from you. Looking at the page, which way does the magnetic field circle the wire?

Use the figure. The dot means current comes out of the page toward you. A compass is at Q on the right and another at S on the left. How do their north ends point?

Use the figure. The cross means current goes into the page away from you. A compass is at P above and R below the wire. How do their north ends point?

Use the figure. The dot means current comes out of the page toward you. Points Q and S are the same distance from the wire. What is true of the field at them?

Use the figure. The cross means current goes into the page away from you. A compass moves from B to A, closer to the same wire. What happens to its deflection?

What does a moving electric charge produce in addition to its electric field?

Which situation is most directly producing a magnetic field because charges are moving?

In 1820, what did Hans Christian Oersted observe when he switched on current in a nearby wire?

A compass near a wire deflects only while charge is flowing through the wire. What conclusion does that support?

In a metal wire, conventional current is defined as the direction positive charge would move. If electrons drift to the left, which current direction sets the wire's magnetic field with the right-hand rule?

A single electron moves through space at constant velocity. What is the shape of the magnetic field made by its motion?

A stream of positive ions moves through a salt solution. Why can that stream create a magnetic field?

A compass is 2.0 cm from a straight wire. When the switch is opened, the current becomes 0 A. What happens to the magnetic field made by that current?

A straight wire's current is reversed from upward to downward. What happens to the magnetic field direction around the wire?

At a fixed distance from a long straight wire, the current is doubled from 3.0 A to 6.0 A. How does the magnetic field strength change?

A compass is moved from 2.0 cm to 4.0 cm from the same straight wire with the same current. How does the wire's magnetic field strength change?

A wire's current changes from 2.0 A to 6.0 A while a compass moves from 3.0 cm to 9.0 cm away. Since B is proportional to I/r, how does the field compare?