Solved: State Faraday's law of induction. Outline how energy losses are reduced in the... [IB Physics (New syllabus)]

Question

HLPaper 2

State Faraday's law of induction.

[2]

Verified

Solution

the size of the induced emf 1 mark

is proportional/equal to the rate of change of flux linkage 1 mark

*The word 'induced' is required here. *

Allow correctly defined symbols from a correct equation. 'Induced' is required for MP1.

Outline how energy losses are reduced in the core of a practical transformer.

[2]

Verified

Solution

laminated core reduces eddy currents 1 mark

less thermal energy is transferred to the surroundings 1 mark

Step-up transformers are used in power stations to increase the voltage at which the electricity is transmitted. Explain why this is done.

[2]

Verified

Solution

for a certain power to be transmitted, large $V$ means low $I$ 1 mark

less thermal energy loss as $P=I^{2}R$ / joule heating 1 mark

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