1.

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

Answer»

 (i) North pole. 

(ii) The strength of the magnetic field of an electromagnet can be changed according to its use and it will be a magnet till the time current passes through it whereas, the strength of permanent magnet can not be increased and can not be magnetized and demagnetized in an instance.



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