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The electric force on an electron is equ...

The electric force on an electron is equal to its weight in an electric field of intensity E. The charge of electron is e and mass is. m Then the value of E be—

A

`(mg)/e`

B

mge

C

`e/(mg)`

D

`(e^2g)/m^2`

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Knowledge Check

  • A circular copper ring of radius r, placed in vacuum, has charge q on it. The electric field intensity at the centre of the ring is E_(1) . The electric field intensity on the axis of the ring at a distance x from its centre is E_(2) . The value of E_(2) will be maximum when x=x' What is the value of E_(1) ?

    A
    0
    B
    `qxxpi r^(2)`
    C
    `qxx2pir^(2)`
    D
    `q/(r^(2))`

  • A circular copper ring of radius r, placed in vacuum, has charge q on it. The electric field intensity at the centre of the ring is E_(1) . The electric field intensity of the axis of the ring at a distance x from its centres is E_(2) . The value of E_(2) will be maximum when x=x' What is the value of E_(2) ?

    A
    `q/((x^(2)+r^(2))^(1//2))`
    B
    `(qx^(2))/((x^(2)+r^(2))^(3//2))`
    C
    `q/((x^(2)+r^(2))^(3//2))`
    D
    `(qx)/((x^(2)+r^(2))^(3//2))`

  • A circular copper ring of radius r, placed in vacuum, has charge q on ti. The electric field intensity at the centre of the ring is E_(1) . The electric field intensity of the axis of the ring at a distance x from its centres is E_(2) . The value of E_(2) will be maximum when x=x' What is the value of x' ?

    A
    `sqrt(2)r`
    B
    `r/(sqrt(2))`
    C
    `r/(sqrt(3))`
    D
    `sqrt(3)r`

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