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An alternating current is given by the e...

An alternating current is given by the equation `I=i_1sinomegatcosomegat`.The rms current is given by

A

`(i_2+i_1)//sqrt2`

B

`(i_2-i_1)//sqrt2`

C

`sqrt({(i_1^2+i_2^2)//2})`

D

`sqrt({(i_1^2+i_2^2)//(sqrt2)})`

Text Solution

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The correct Answer is:
C
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CHHAYA PUBLICATION-ALTERNATING CURRENT -EXERCISE (Multiple Choice Question)
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  2. An ac having a peak value 1.41 A is used to heat a wire. A dc producin...

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  3. The general equation for the instantneous voltage of a 50 Hz generator...

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  4. The relation between angular velocity (omega) and driving frequency(f)...

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  5. Form factor of an alternating voltage is the ratio of

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  6. The value of an ac voltage at time 0letle(pi)/omega is given by V=V0si...

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  7. The rms value of potential difference V shown in the Fig.2.42 is

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  8. The rms value and frequency of an ac current are 5A and 50 Hz respecti...

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  9. In an ac circuit containing capacitance , only the current

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  10. In an LR circuit , the phase angle between alternating voltage and alt...

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  11. In an LCR series circuit, the capacitance is reduced to one-fourth, wh...

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  12. The phase difference between V and I of an LCR circuit in series reson...

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  13. The reactance of an inductor of inductance 1/piH at frequency 50 Hz is

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  14. Which quantity in an ac circuit is not dependent on frequency?

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  15. The condition of getting maximum current in an LCR series circuit is

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  16. The series resonant frequency of an LCR circuit is f. IF the capacitan...

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  17. A coil has resistance 30 Omega and inductive reactance 20 Omega at 50 ...

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  18. A fully charged capacitor C with initial charge q0 is connected to a ...

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  19. A voltage V0sinomegat is applied across a series combination of resist...

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  20. When an ideal choke is connected to an ac source of 100V and 50Hz, a c...

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