CAPE Physics Unit 2 · 2005 · Paper 1 · Question 3(a)(ii)
Questions on electromagnetic induction and transformers.
State Lenz's Law.
The mark scheme is shown once you've answered.
Practise this questionOther parts of this question
- 3(a)(i)State Faraday's law of electromagnetic induction.[1 mark]
- 3(b)Giving an example, explain how Lenz's law can be considered as an application of the law of conservation of energy.[2 marks]
- 3(c)(i)Calculate the magnetic flux through each turn of the coil.[2 marks]
- 3(c)(ii)If the electromagnet is turned off and it takes 0.20 s for the field to go down to zero, what would be the e.m.f. induced in the coil of wire?[2 marks]
- 3(c)(iii)State TWO reasons why transformers are NOT usually 100 per cent efficient.[2 marks]
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