Question

You have been provided with a solenoid AB.
(i) What is the polarity at end A ?
(ii) Give one advantage of an electromagnet over a permanent magnet

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Answer 1

Explanation:

Strong magnetic field is produced by electromagnet. (ii) By increasing or decreasing the strength of current or the number of turns in the solenoid, electromagnet's magnetic strength can be increased. (iii) The polarity of an electromagnet can be reversed by sending the current in the reverse direction.

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Answer 2

Explanation:

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(i) North pole.

(ii) The magnetic field strength can be change in electromagnet. But not in permanent magnet