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In a balanced wheat stone bridge, curren...

In a balanced wheat stone bridge, current in the galvanometer is zero. If remains zero when-
`(1)` battery emf is increased
`(2)` all resistance are increased by `10`ohms
`(3)` all resistance are made five times
`(4)` the battery and the galvanometer are intercharged

A

Battery emf is increase

B

The attery and the galvanometer are interchanged

C

All resistance are made five time

D

All of these

Text Solution

Verified by Experts

The correct Answer is:
D
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Figure shows a balanced Wheatstone's bridge (1) If P is slightly increased, the current in the galvanometer flow from A to C. (2) If P is slightly increased, the current in the galvanometer flows C to A. (3) If Q is slightly increased, the current in the galvanometer flows from C to A. (4) If Q is slightly increased, the current in the galvanometer flows from A to C.

If the current current sensitivity of a moving coil galvanometer is increased by 20% , its resistance also increases by 1*5 times. How will the voltage sensitivity of the galvanometer be affected?

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Knowledge Check

  • The initial rate of increase of current, when a battery of emf 6 V is connected in series with an inductance of 2 H and resistance 12Omega , is

    A
    `0.5As^(-1)`
    B
    `1As^(-1)`
    C
    `3As^(-1)`
    D
    `3.5As^(-1)`

  • If all resistors in the shown network are of equal resistance, and the battery is of emf equal to 10 V and internal resistance equal to 1 Omega , what should be resistance of each resistor so that the battery delivers maximum power

    A
    `1Omega`
    B
    `2Omegga`
    C
    `3Omega`
    D
    `4Omega`

  • When a resistance of 2 ohm is placed across a battery the current is 1 A and when the resistance across the terminals is 17 ohm, the current is 0.25A. The emf of the battery is

    A
    4.5 V
    B
    5V
    C
    3V
    D
    6V
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