Electric Circuits
The resistance of a strip of copper of rectangular cross section is 2 Ω. A metal of resistivity twice that of a copper is coated on its upper surface to a thickness equal to that of copper strip. The resistance of composite strip will be

 3 / 2 Ω.
 3 / 4 Ω.
 6 Ω.
 4 / 3 Ω.

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Electric Circuits
What is referred as the average value in AC opearation?

 Average of all values of the (+)ve and (-)ve half.
 Average of all values of the phase sequences.
  Average of all values of an alternating quantity over a complete cycle.
 Average of all values of an alternating quantity.

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