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Find the resistance when two 20 ohm resisters are connected in parallel and another 20 ohm resister's ends are connected to parallel resistors.
Ans :  
two 20 ohm in parallel ,
Effective resistance , Rp = 20 *  20 / 20 + 20  = 400/40= 10 ohm.
Total resistance = Rp + 20 ohm = 10 + 20 = 30 ohm.


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