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In a series L-R circuit, connected with ...

In a series L-R circuit, connected with a sinusoidal ac source, the maximum potential difference across L and R are respectivaly 3 volts and 4 volts.
At an instant the potemtial difference across resistor is 2 volts. The potential difference in volt, across the inductor at the same instant will be:

A

`3 cos 30^(@)`

B

`3 cos 60^(@)`

C

`6 cos 45^(@)`

D

6

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • In a series L-R circuit, connected with a sinusoidal ac source, the maximum potential difference across L and R are respectivaly 3 volts and 4 volts. At the same instant, the magnetitude of the potential difference in volt, across the ac source may be

    A
    `4+3sqrt(3)`
    B
    `(4+3sqrt(3))/2`
    C
    `1+sqrt(3)/2`
    D
    `2+sqrt(3)/2`

  • In a series L-R circuit, connected with a sinusoidal ac source, the maximum potential difference acrosssd L and R are respectively 3 volts and 4 volts At the same instant, the magnitude of the potential difference in volt, across the ac source will be

    A
    `3 cos 67^(@)`
    B
    `5 sin 37^(@)`
    C
    `4 cos 97^(@)`
    D
    0

  • In a series L-R circuit, connected with a sinusoidal ac source, the maximum potential difference across L and R are respectivaly 3 volts and 4 volts. If the current at this instant is decreasing the magnitude of potential difference at that instant across the ac source is

    A
    Increasing
    B
    Decreasing
    C
    Constant
    D
    Cannot be said

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