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Electric Circuits

Electric Circuits
In RL series circuit R=2Ω and L=2mH. What is the value of time constant?

 100sec
 1msec
 2msec
 4msec

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Electric Circuits
You have to replace 1500 Ω resistor in radio. You have no 1500 Ω resistor but have several 1000 Ω ones which you would connect

 three in series.
 three in parallel.
 two in parallel.
 two in parallel and one in series.

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Electric Circuits
Two wires of A and B of the same material and length ‘l’ and ‘2l’ have radius ‘r’ and ‘2r’ respectively. The ratio of their specific resistance will be

 1:2.
 1:8.
 4:1.
 1:1.

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Electric Circuits
Galvanizing is the coating of

 zinc.
 brass.
 chromium.
 lead.

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Electric Circuits
While Thevenizing a circuit between two terminals, VTH is equal to

 short circuit terminal voltage.
 net voltage available in the circuit.
 open circuit terminal voltage .
 none of these.

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Electric Circuits
Which of the followings is the expression for energy stored in a capacitor?

 C dv / dt.
 Cv.
 C / v.
 (1 / 2) Cv2.

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