Magnetism and electromagnetism - Short answer questions

Some short answer questions will be multiple choice questions, these will appear in both exam papers, and at both tiers. Multiple choice questions are asked as questions, often starting with 'What is …' or 'Which of these …'.

You have four options to choose from in a multiple choice question. You must only choose one of these options, by writing your answer (A, B, C, or D) in a box.

It may help to reject any answers that you feel are obviously wrong, so that you can focus on choosing the right answer.

Other short answer questions will start with command words such as 'describe' or 'explain'. Some command words are easy to understand such as:

  • 'calculate' or 'determine' for maths questions
  • 'complete' to fill in a gap in a table or graph
  • 'define' to give the meaning of an important word
  • 'suggest' where you use your knowledge in an unfamiliar situation

The command words 'describe' and 'explain' can be confusing. If you are asked to describe a graph, you will be expected to write about its overall shape, whether it is linear or curved, the slope of gradients etc. If you are asked to explain why a pattern or trend is seen in a graph, you will be expected to use your science knowledge, not just say what you see (which is a description), eg 'The graph shows a steep linear increase for the first three hours because…'.

'Explain how' and 'why' questions often have the word 'because' in their answer. 'Describe' questions don't.

The number of marks per question part is given in this form '[2 marks]'. It is essential that you give two different answers if a question is worth two marks. Sometimes you can gain a second mark by giving the units in a calculation or stating specific data points, eg the speed of the object decreased by 8 m/s.

Questions courtesy of Eduqas.

Sample question 1 - Foundation

Question

The following diagram illustrates the magnetic field around a current carrying wire:

Wire runs vertically, current flowing bottom to top. Magnetic field rotates anticlockwise. Second wire runs vertically, current flowing top to bottom. Magnetic field rotates in a clockwise direction.

a) Describe the shape of the magnetic field lines. [1 mark]

b) The strength of the current is then increased. State how the magnetic field changes. [1 mark]

c) State what happens to the magnetic field when the current is turned off. [1 mark]

a) The magnetic field lines have a circular pattern.

b) There will be more field lines and they will be closer together.

c) There will be no magnetic field.

Sample question 2 - Higher

Question

Use the correct words from the list to complete the sentences regarding how a transformer works. [5 marks]

(The words can be used more than once or not at all)

secondaryprimarycorecurrentmagneticelectricwire

A transformer works because an alternating ______ in the ______ coil produces a changing ______ field in the ______ and then in the secondary coil. This induces an alternating current in the ______ coil.

A transformer works because an alternatingcurrentin theprimarycoil produces a changingmagneticfield in thecore/primaryand then in the secondary coil. This induces an alternating current in thesecondarycoil.