Magnetic Fields and Forces on Charges

Flashcards covering the key concepts related to magnetic fields and forces on charged particles, including their interactions with current, the behavior in magnetic fields, and fundamental equations.

What does the presence of a magnetic field do to a moving charged particle?

A charged particle moving in a magnetic field experiences a magnetic force, which can cause it to curve or move in a circular path if the velocity is perpendicular to the field.

What rule do you use to determine the direction of the force on a charged particle in a magnetic field?

The right-hand rule is used to determine the direction of the force on a charged particle moving in a magnetic field.

If a charged particle is moving perpendicular to a magnetic field, what type of path will it follow?

It will move in a circular path.

What is the equation for the radius of the circular path that a particle takes in a magnetic field?

The radius is given by the equation R = \frac{mv}{qB}, where m is mass, v is velocity, q is charge, and B is magnetic field strength.

How do current-carrying wires behave in an external magnetic field?

Wires carrying current will feel a force when placed in a magnetic field, similarly to charged particles.

What is the direction of the magnetic field created by a current-carrying wire?

The direction of the magnetic field can be determined using the right-hand rule: fingers wrap in the direction of the current, and the thumb points in the direction of the magnetic field.

If two parallel wires carry current in the same direction, what will happen to them?

They will attract each other.

What happens when the currents in two parallel wires flow in opposite directions?

They will repel each other.

What is a velocity selector?

A device that uses electric and magnetic fields to select particles with a specific velocity.

What is the relationship between a current loop and a bar magnet?

A current loop creates a magnetic field that has properties similar to a bar magnet, including having a north and south pole.

What happens to a current loop when it is placed in an external magnetic field?

The current loop will experience a torque that causes it to rotate to align its magnetic dipole moment with the external magnetic field.