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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» (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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