Topic 6 - Electromagnetism (Paper 2)

Question 1

is there a magnetic field around a straight, current-carrying wire?

Answer 1

yes, made up of concentric circles with the wire in the centre

Question 2

is there a magnetic field around a flat circular coil?

Answer 2

yes, made up of concentric ellipses of magnetic field lines around the coil

Question 3

is there a magnetic field around a solenoid?

Answer 3

yes, as long as it is current-carrying. the magnetic field outside the coil is just like one around a bar magnet, so each end acts like a north/south pole.