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Electric Circuits

Electric Circuits
In which of the following oscillations are not present?

 Over damping
 Under damping
 Both 2 and 3
 Critical damping

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Electric Circuits
Which of the following is the heaviest?

 Molecule.
 Atom.
 Electron.
 Proton.

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Electric Circuits
If a resistor and an inductor are connected in series across a voltage source. Which two parameters in that circuit increase if frequency of voltage source increases?

 VL and VR.
 Z and I.
 VL and Z.
 VL and I.

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Electric Circuits
If c1 = 8 μF, c2 = 4 μF, c3 = 7 μF c1, c2 are in series with c3 in parallel; effective capacitance will be

 3 μF.
 6 μF.
 2.21 μF.
 9.67 μF.

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Electric Circuits
A series RLC circuit is connected across a 240V, 50 Hz supply. When the voltage across capacitor is 250V, a maximum current of 0.5A flows in the circuit. Find the resistance.

 480 Ohms.
 500 Ohms.
 100 Ohms.
 1000 Ohms.

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Electric Circuits
An AC voltage of 200 V at 50 Hz is applied to a coil which draws 5 A and dissipates 1000 W. The resistance and impedance of the coil respectively are

 40 Ω and 200 Ω.
 25 Ω and 5 Ω.
 40 Ω and 40 Ω.
 50 Ω and 200 Ω.

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