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Alternating Current Physics - Alternating Current

Bihar Board (BSEB) - STD 12 Science - Physics (BSEB - English Medium). 30 questions in this chapter.

Question types

Alternating Current question types

30 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

30
Questions
6
Question groups
5
Question types
Sample Questions

Alternating Current questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 3M.C.Q [1M]1 Mark
The phase difference between current and voltage in an A.C. circuit containing capacitance only is :
  • A
    $0^{\circ}$
  • ✓
    $90^{\circ}$
  • C
    $180^{\circ}$
  • D
    $45^{\circ}$

Answer: B.

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Q 5M.C.Q [1M]1 Mark
In an alternating current circuit, the phase difference between current I and voltage is $\phi$ then the wattlen component of current will be :
  • A
    $I cos \phi$
  • B
    $I tan \phi$
  • ✓
    $I sin \phi$
  • D
    $I cos \phi$

Answer: C.

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Q 114 Marks Questions4 Marks
Draw a labelled diagram of an a.c. generator. Obtain the expression for the emf induced in the rotating coil of N turns each of cross-sectional area A in the presence of a magnetic field $\overrightarrow{ B }$.
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Q 17Long Answer Type Questions [5M]5 Marks
In an A.C. circuit inductance L, capacitance C and resistance R are connected in series. Find the expression for impedance Z of circuit and phase difference between V and I.### Prove that : $Z=\sqrt{R^{2}+(\omega L-\frac{1}{\omega C})^{2}}$ and $tan \phi=\frac{(\omega L-\frac{1}{\omega C})}{R}$
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