Question

a negative charge is moving across the room from south to north. a magnetic field runs from east to west. in what direction is the magnetic force moving negative charge? a. toward the east b. toward the west c. toward the floor d. toward the ceiling

Answer 1

The correct answer is:

c. toward the floor

In fact, we can find the direction of the magnetic force that acts on a positive moving charge by using the right-hand rule:

- index finger: direction of the charge

- middle finger: direction of magnetic field

- thumb: direction of the force

We also have to keep in mind that for a negative charge, we should reverse the direction of the thumb in order to find the correct direction of the force.

In this case:

- index finger: south to north

- middle finger: east to west

- thumb: toward the ceiling

and since the charge is negative, we have to reverse the sign of the thumb, so the magnetic force points toward the floor.

Answer 2

The correct answer for the question that is being presented above is this one: "a. toward the east." A negative charge is moving across the room from south to north. a magnetic field runs from east to west. The direction of the magnetic force moving negative charge is toward the east.