How do you demagnetise an iron bar using coil

Leave it in the coil for a few minutes

Keep moving it in and out of the coil for a few time

Test

Physics test

Yahya AbdelAal 5 preguntas

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1What is a transistor?
1. AAn electrical switch
2. BA type of resistor
3. CA coil
4. DNone of the above
2How do you magnetise an iron bar using a magnet
1. AStroking it back and forth
2. BStroking it only one way
3. CHammering it
4. DAll of the above
3How do you demagnetise an iron bar using coil
1. ALeave it in the coil for a few minutes
2. BKeep moving it in and out of the coil for a few time
3. CTake it out of the coil
4. DNone of the above
4If lamp A has a current of 1.5 what will the current be in lamp B?
1. A2A
2. B5A
3. C1.5A
4. D10A
5If the switch was closed, which lamp will turn on?
1. AThe one in the middle
2. BThe one at the top
3. CBoth of them
4. DNone of them