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Electric Circuits

Electric Circuits
Atoms with fewer than 4 valence electrons are

 semi-conductor.
 insulator.
 none of these.
 conductor.

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Electric Circuits
A series circuit consists of R = 20 Ω, L = 20 mH, and AC supply 60 V with f = 100 Hz. The phase angle of current in respect of supply voltage will be

 32.1o.
 40.4o.
 28.8o.
 20.2o.

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Electric Circuits
If the length of a wire of resistance R is uniformly stretched to n times its original value, what will be its new resistance

  n2R.
  R / n2.
  nR .
  n2 / R.

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Electric Circuits
In a series R, L circuit, voltage across resistor and inductor are 3 V and 4 V respectively, then what is the applied voltage?

 4V
 7V
 3V
 5V

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Electric Circuits
A particular current is made up of two component : a 10 A and a sine wave of peak value 14.14 A. The average value of current is

 zero.
 24.14 A.
 14.14 A.
 10 A.

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Electric Circuits
A 230V, 50Hz voltage is applied to a coil having L = 5H and R = 2 Ohm in series with capacitance C. When the voltage across the coil is 400V, find the current in the circuit?

 0.1578 A.
 0.4583 A.
 0.1465 A.
 0.2547 A.

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