Six original Cambridge-style questions on electromagnetic induction: describing the experiment, the factors that change the e.m.f., the still-magnet trap, reversing the current, and a real dynamo.
State what is meant by electromagnetic induction, and what must happen for an e.m.f. to be induced in a coil.
Describe a simple experiment to show that moving a magnet near a coil produces an e.m.f.
A magnet is moved into a coil and a small deflection is seen. State three changes that would give a larger deflection.
A magnet is pushed into a coil and then held still inside it. Describe what the meter reads while the magnet is held still, and explain why.
When a magnet is pushed into a coil the meter needle deflects to the right. State what happens to the needle when the magnet is then pulled out, and why.
A bicycle dynamo lights a lamp only while the bike is moving. Explain, in terms of induction, why the lamp goes out when the bike stops, and why it gets brighter as the bike goes faster.
Mark this once you have attempted all six and checked your working. It records a Practiced badge on the topic and adds a one-time bonus. Revealing the solutions alone does not count.