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Electric Circuits

Electric Circuits
The unit of resistivity is

 Ω / m².
 Ω / metre.
 Ω.
 Ω - metre.

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Electric Circuits
A capacitor having a capacitance of 40 μF is connected across 250 V DC source. The charging current will be least

 when capacitor is fully charged.
 initially.
 when capacitor is half charged.
 when capacitor is almost 25% charged.

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Electric Circuits
A wire of 0.14 mm diameter and specific resistance 9.6 Ω - cm is 440 cm long. The resistance of the wire will be

 27.4 Ω.
 11.3 Ω.
 13.7 Ω.
 9.6 Ω.

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Electric Circuits
A two port network is defined by the relation The value of Z12 is

 -3.
 3/41.
 2/31.
 3.

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Electric Circuits
A 20 μF capacitor and 200 W, 220 V lamp is connected in series across a 220 V alternating supply. In which frequency of the supply the lamp will glow dimmest?

 10 Hz.
 1 Hz.
 1000 Hz.
 100 Hz.

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

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

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