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A metal rod of length of 10 cm and a r...

A metal rod of length of 10 cm and a rectangular cross - section of 1 cm `xx (1)/(2)` cm is connected to a battery across apposite face . The resistance will be .'

A

same irrespective of the three faces

B

maximum when the battery is connected across 1 cm ` xx (1)/(2)` cm faces

C

maximum when the battery is connected across 10 cm` (1)/(2)` cm faces

D

maximum when the battery is connected across 10 cm `xx 1 ` cm faces .

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Knowledge Check

  • A metal rod of length 10 cm and a rectangular cross-section of 1 cm xx1/2 cm 1s connected to a battery across opposite faces. The resistance will be :

    A
    maximum when the battery is connected across 1 `cmxx1/2` cm faces.
    B
    maximum when the battery is connected across 10 `cmxx1cm` faces.
    C
    maximum when the battery is connected across 10 `cmxx1/2` cm faces.
    D
    same irrespective of the three faces.

  • A resistance of 2Omega is connected across one gap of a metre-bridge (the length of the wire is 100 cm) and an unknown resistance, greater than 2 Omega , is connected across the other gap. When these resistances are interchanged, the balance point shifts by 20 cm. Neglecting any corrections, the unknown resistance is

    A
    `3Omega`
    B
    `4Omega`
    C
    `5Omega`
    D
    `6Omega`

  • A resistance of 2Omega is connected across one gap of a metre-bridge (the length of the wire is 100 cm) and an unknown resistance, greater than 2Omega , is connected across the other gap. When these resistances are interchanged, the balance point shifts by 20 cm. Neglecting any corrections, the unknown resistance is :

    A
    `3Omega`
    B
    `4Omega`
    C
    `5Omega`
    D
    `6Omega`

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