
A current-carrying wire is placed in a uniform magnetic field.
(a) Describe how the wire should be placed to experience the
maximum force due to the magnetic field.
maximum force due to the magnetic field.

Important Questions on Magnetic Fields and Electromagnetism
A current-carrying wire is placed in a uniform magnetic field.
(b) Describe how the wire should be placed to experience no force due to the magnetic field .

A current-carrying conductor placed at right angles to a uniform magnetic field experiences a force of Determine the force on the wire when, separately:
(a) the current in the wire is increased by a factor of

A current-carrying conductor placed at right angles to a uniform magnetic field experiences a force of Determine the force on the wire when, separately:
(b) the magne tic flux density is halved

A current-carrying conductor placed at right angles to a uniform magnetic field experiences a force of Determine the force on the wire when, separately:
(c) the length of the wire in the magnetic field is reduced to
of its original length.

A copper wire carrying a current of has of its length placed in a uniform magnetic field, as shown.
The force experienced by the wire is when the angle between the wire and the magnetic field is
(a) Calculate the magnetic flux density.

A copper wire carrying a current of has of its length placed in a uniform magnetic field, as shown.
The force experienced by the wire iswhen the angle between
the wire and the magnetic field is
(b) State the direction of the force experienced by the wire.

This diagram shows a view from above of two long, parallel strips of aluminium foil, and , carrying a current downwards into the paper.
(a) On a copy of the diagram, draw the magnetic field around and between the two strips.

This diagram shows a view from above of two long, parallel strips of aluminium foil, A and B, carrying a current downwards into the paper.
(b) State and explain the direction of the forces caused by the current in the strips.
