Magnetic Fields

Question 1

Magnetic field

Answer 1

A force field surrounding a magnet or current-carrying wire which acts on any other magnet or current-carrying wire placed in the field.

Question 2

Line of force / Magnetic field line

Answer 2

Line along which a north pole would move in the field.

Question 3

Motor effect

Answer 3

The effect in which a current-carrying wire placed at a non-zero angle to the lines of force of an external magnetic field experiences a force due to the field which is perpendicular to the wire and to the lines of force.

Question 4

Magnetic flux density, B

Answer 4

The force per unit length per unit current on a current-carrying conductor at right angles to the magnetic field lines. Unit is the Tesla (T) = 1 N m^-1 A^-1.

Question 5

Force on a wire in a magnetic field equation

Answer 5

F = BIL

Question 6

Force on a charged particle moving through a uniform magnetic field

Answer 6

F = BQv

Question 7

Radius of the path followed by a charged particle in a magnetic field

Answer 7

r = mv/BQ