Electric Circuits
Third pin of a 3 pin plug is thicker and longer

 none of these.
 for designing purpose.
 for protection purpose.
 all pins are of same size.

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Electric Circuits
A certain network consists of large number of ideal linear resistances, one of which is designated as R and two constant ideal source. The power consumed by R is P1 when only the first source is active and P2 when only second source is active. In both sources are active simultaneously then the power consumed by R is

 (√P1 ± √P2)2.
 (P1 ± P2 )2.
 √P1 ± √P2.
 P1 ± P2 .

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