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In the circuit shown in the figure, the ...

In the circuit shown in the figure, the ideal ammeter reading for current is taken
(`a`) with both switches open
(`b`) with both switches closed.
The readings are same in the cases. The value of resistance `R` is

A

`2Omega`

B

`3Omega`

C

`4.5 Omega`

D

`7.5 Omega`

Text Solution

Verified by Experts

When both switches are open, then reading of ammeter is `24//3=3A`
When both switches are closed.
`V_(AB)=9VrArrV_(HG)=15rArr` So current through `R` is `2A`.
Hence `R=9//2=4.5Omega`
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Knowledge Check

  • In the circuit shown in figure, reading of ammeter will

    A
    shows no deflection if `S_1` is closed
    B
    decrease if `S_2` is closed
    C
    increase if `S_2` is closed
    D
    decrease if `S_2` is closed

  • In the circuit shown in figure, what will be the readings of voltmeter and ammeter?

    A
    800 V, 2 A
    B
    220 V, 2.2 A
    C
    300 V, 2 A
    D
    100 V, 2 A

  • In the circuit shown in figure the reading of ammeter is the same with both switches open as with both closed. Then find the resistance R . (ammeter is ideal).

    A
    `550 Omega`
    B
    `400 Omega`
    C
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    D
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