Electric Circuits
The resistivity of semi-conductors at room temperatures is

 1000 to 1500 ohm - cm.
 1.6 × 106 to 100 × 106 ohm - cm.
 0.01 to 50 ohm - cm.
 109 to 1012 ohm - cm.

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Electric Circuits
Which of the following characteristics is/are attributed to an ideal independent voltage source?

 both ‘b’ and ‘d’.
 Independent of the magnitude of voltage supplied.
 Independent of the direction of flow of current.
 Independent of magnitude of current supplied..

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