Electromagnetism questions | form four Physics

(2160) Question Category: Short answers

Under what circumstance are eddy currents formed?.

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(2161) Question Category: Short answers

Give two advantages and two disadvantages of eddy currents.

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(2162) Question Category: Short answers

A 250 V mains transformer has 1000 turns in the primary coil and it is used to supply
energy to a 15V, 35W domestic refrigerator.
(i) How many turns are there in the secondary coil?
(ii) What is the efficiency of the transformer if the current drawn from the main supply is 175 mA?

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(2163) Question Category: Short answers

What is an induction coil?

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(2164) Question Category: Short answers

Describe the structure of an induction coil and briefly explain its mode of action.

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