Electric Circuits
The equation for 25 cycles current sine wave having rms value of 30 amps, will be

 30sin25πt.
 42.4sin50πt.
 42.4sin25πt.
 30sin50πt.

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

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