Magnetic Fields Flashcards
A charged particle moves through a magnetic field. In which situation is the magnetic force zero?
When the particle moves in the direction of the magnetic field vector.
Which is true about magnetic field lines?
They extend from a north pole and toward a south pole, and they are more crowded near a pole.
Which is true about a magnetic force acting on a charged particle moving through a magnetic field?
The force cannot change the speed.
Which describes a magnetic field vector and a magnetic field line?
The vector is tangent to a field line, in the same direction as the field line
A charged particle moves through uniform electric and magnetic fields. In which case is there the possibility that the electric force and magnetic force cancel?
The electric field and the magnetic field are perpendicular.
A charged particle moves through uniform electric and magnetic fields. Which is true about the magnetic force and the electric force acting on the particle?
The magnetic force depends on the speed; the electric force does not depend on the speed.
When an electron circles in a uniform circular motion, which describes its kinetic energy?
It stays the same
When a charged particle moves along a helical path in a uniform magnetic field, which component determines the pitch of the path?
the velocity component parallel to the magnetic field vector
A wire with current lies in a uniform magnetic field. In which situation is the magnetic force on the wire zero?
When the length vector is in the direction of the magnetic field vector
Which describes the length vector?
It is in the direction of the current.
