Physics: Magnetic Fields Chapter 28

Play an AI-generated podcast conversation about this lesson

What is the direction of the magnetic field produced by a long straight wire carrying a current?

Opposite to the direction of the current

Circles that are concentric with the wire (correct)

Radially outward from the wire

In the direction of the current

What is the direction of the magnetic field due to a current-carrying wire at a point below the wire, if the current is flowing from north to south?

East

North

West (correct)

Up

What is the orientation of the north pole of a magnetic compass needle placed near a current-carrying wire, if the current is flowing from east to west?

North

South (correct)

East

West

What is the shape of the magnetic field lines around a long straight wire carrying a current?

Concentric circles around the wire Signup and view all the answers

What happens to a magnetic compass needle placed near a current-carrying wire?

It points towards the south Signup and view all the answers

In which direction do the magnetic field lines emerge from a current-carrying wire?

Circles around the wire Signup and view all the answers

What is the unit of a magnetic field?

kg/C·s Signup and view all the answers

What is the direction of the magnetic force on a charged particle?

Perpendicular to the velocity and magnetic field Signup and view all the answers

If an electron moves in the negative x direction, through a uniform magnetic field in the negative y direction, what is the direction of the magnetic force on the electron?

In the negative z direction Signup and view all the answers

What is the direction of magnetic field lines at a point?

None of the above Signup and view all the answers

When is the magnetic force on a charged particle in the direction of its velocity?

Never, the magnetic force is always perpendicular to the velocity Signup and view all the answers

What is the direction of the magnetic force on a charged particle moving in a uniform magnetic field?

Perpendicular to the velocity and magnetic field Signup and view all the answers

What is the direction of the magnetic dipole moment of a current-carrying loop of wire?

Positive z direction Signup and view all the answers

If a uniform magnetic field is in the positive x direction, what is the direction of the magnetic torque on the loop?

Positive y direction Signup and view all the answers

What is the condition for the potential energy of a loop of current-carrying wire to be a minimum in a uniform magnetic field?

The magnetic dipole moment is in the same direction as the field Signup and view all the answers

For which orientation of a magnetic dipole in a uniform magnetic field is the potential energy the greatest?

µ anti-parallel to B Signup and view all the answers

What is the direction of the magnetic field in which the magnetic torque on the loop is zero?

Parallel to the magnetic dipole moment Signup and view all the answers

What is the relationship between the magnetic dipole moment and the magnetic field when the potential energy is a minimum?

The magnetic dipole moment is in the same direction as the magnetic field Signup and view all the answers

Physics: Magnetic Fields Chapter 28

Choose a study mode

Podcast

Questions and Answers