Give the factors that affect strength of magnetic field at a point due to a straight conductor carrying current. [3 MARKS]
(a) Draw a sketch to show the magnetic lines of force due to a current-carrying straight conductor.
(b) Name and state the rule to determine the direction of magnetic field around a straight current-carrying conductor.
The force due to the magnetic field on a current carrying conductor is _______ to the magnetic field and_________ to the current.