InterviewSolution
 Saved Bookmarks
    				| 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.  | 
                            |