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Electric Circuits

Electric Circuits
Four capacitors each of 40 µF are connected in parallel, the equivalent capacitance of the system will be

 40 µF
 160 µF
 10 µF
 5 µF

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Electric Circuits
The resistivity of the conductor depends on

 area of the conductor.
 type of material.
 none of these.
 length of the conductor.

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Electric Circuits
The resistance of a strip of copper of rectangular cross section is 2 Ω. A metal of resistivity twice that of a copper is coated on its upper surface to a thickness equal to that of copper strip. The resistance of composite strip will be

 4 / 3 Ω.
 3 / 2 Ω.
 3 / 4 Ω.
 6 Ω.

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Electric Circuits
The energy stored by a capacitor is given by

 Q2 / 2C.
 1/2 QV.
 all of them.
 1/2 CV2.

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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

 40.4o.
 28.8o.
 32.1o.
 20.2o.

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Electric Circuits
Current magnification will occur in which of the following case?

None of these
 Parallel resonance
 Both
 Series resonance

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