Paper 3 Magnetic Fields Drills

Q1 Comparing Field Sources

1. Compare the field pattern around a straight wire, circular coil and long solenoid. [4]
2. Explain why a solenoid can act like a bar magnet. [3]
3. A student reverses the current in the solenoid. State and explain the effect on the magnetic poles. [2]

Q2 Two-Wire Superposition

Two long parallel wires carry equal currents in the same direction.

1. Describe qualitatively the resultant magnetic field at a point midway between the wires. [2]
2. Describe qualitatively the resultant magnetic field outside the pair of wires. [2]
3. Explain why magnetic field is treated as a vector quantity. [2]