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State two advantages of an electromagnet...

State two advantages of an electromagnet over a permanent magnet.

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(i) An electromagnet can be made to produce a strong magnetic field (increasing the number of turns in the coil).
(ii) The polarity of the electromagnet can be reversed.
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ICSE-QUESTION PAPER-2018 -SECTION-II
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  5. A half metre rod is pivoted at the centre with two weights of 20 gf an...

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  6. A half metre rod is pivoted at the centre with two weights of 20 gf an...

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  8. The pulley system drawn lifts a load of 150 N when an effort of 60 N i...

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  9. Is the above pulley system an ideal machine or not?

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  10. A ray of light XY passes through a right angled isosceles prism as sho...

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  11. A ray of light XY passes through a right angled isosceles prism as sho...

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  12. A ray of light XY passes through a right angled isosceles prism as sho...

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  18. The diagram above shows a wire stretched over a sonometer. Stems of tw...

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