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From Karnataka Open Educational Resources
2 bytes added ,  10:35, 25 June 2015
Line 79: Line 79:  
* '''Prerequisites/Instructions, if any'''
 
* '''Prerequisites/Instructions, if any'''
 
1. Do not use A.C. current
 
1. Do not use A.C. current
 +
 
2. make a copper spring carefully
 
2. make a copper spring carefully
 
3. use only the thin copper wire.
 
3. use only the thin copper wire.