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Electric Circuits

Electric Circuits
For occurrence of resonance which of the following elements are required?

 Both 2 and 3
 L
 C
 R

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Electric Circuits
A wire 2.5 m long is bent into a square. An current of 100 A flowing through the wire will produce a magnetizing force at the center of the square, equal to

 196 AT / m.
 144 AT / m.
 72 AT / m.
 222 AT / m.

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Electric Circuits
Under resonance condition the phase angle between voltage phase and current phase is

 0°
 45°
 - 90°
 90°

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Electric Circuits
The energy required to charge a 10 μF capacitor to 100 V is

 10 × 10-9 J.
 0.05 J.
 0.01 J.
 5 × 10-9 J.

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Electric Circuits
Absolute permittivity of dielectric medium is represented as

 εr/ε0
 εr
 εrε0
 ε0

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Electric Circuits
A balanced delta connected load has an impedance of 9∠30o Ω per phase. What is the impedance per phase of its equivalent star?

None of these
 3∠30o Ω.
 30∠30o Ω.
 27∠30o Ω

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