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Refer .for what value of R (in ohm) wil...

Refer .for what value of `R` (in ohm) will the current in galvanmeter `G` be zero

Text Solution

Verified by Experts

The correct Answer is:
7
When the currect through galvanometer is zero,
then pot diff across `R Omega = 7 V`
pot diff across `5 Omega= 12 - 7= 5 V`
current in `5 Omega` = (5)/(5) = 1A`
Resistance, `R = (7)/(1)= 7 Omega `
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Knowledge Check

  • For what value of R , the current in galvanometer is zero ?

    A
    `5Omega`
    B
    `2Omega`
    C
    `7Omega`
    D
    `1Omega`

  • For what value of R , current in the galvanometer is zero ?

    A
    `1 Omega`
    B
    `2 Omega`
    C
    `5 Omega`
    D
    `7 Omega`

  • The current in the resistance R will be zero if

    A
    `E_(1)r_(1)=E_(2)r_(2)`
    B
    `(E_(1))/(r_(1))=(E_(2))/(r_(2))`
    C
    `(E_(1)+E_(2))r_(1)=E_(1)r_(1)`
    D
    `(E_(1)-E_(2))r_(1)=E_(2)r_(1)`