IGCSE electromagnetism question - transformers and electromagnetic induction

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My physics paper 4 exam is in 28 days and I am so stressed. But thanks to you sir all of this stress is gone. I always solve past papers after watching your videos and if I do get an A or A* it's all because of your hard work with these videos. Many thanks!

ethix
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in a.) can we also write increase in current???

FierceBird
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for all your videos what exam board are you teaching??

haliemaaoryakhil