Paper 2 Magnetic Fields Drills

Q1 Straight Wire Field Pattern

A long vertical wire carries current upward.

1. Describe the shape of magnetic field lines around the wire. [1]
2. State the rule used to determine their direction. [1]
3. Explain what happens to the field strength at a fixed point if the current doubles. [2]

Q2 Solenoid Field

A solenoid is connected to a d.c. supply.

1. Describe the magnetic field inside a long solenoid. [2]
2. State two ways to increase the magnetic field strength. [2]
3. Explain why soft iron is suitable as the core of a switchable electromagnet. [2]

Q3 Magnetic Field Notation

A diagram shows a uniform field with crosses in a region.

1. State the direction represented by crosses. [1]
2. Explain why equally spaced crosses represent a uniform field. [2]
3. State what would be shown if the same field was out of the page. [1]