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A uniform magnetic field acts right angl...

A uniform magnetic field acts right angles to the direction of motion of electrons. As a result, the electron moves in a circular path of radius 2 cm. If the speed of electrons is doubled, then the radius of the circular path will be

A

0.5 cm

B

2.5 cm

C

5.0 cm

D

7.5 cm

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Knowledge Check

  • A uniform magnetic field at right angles to the direction of motion of electron . As a result , the electron moves in circular parth of radius 2 cm . If the speed of electron is doubles , then the radius of the circular path will be

    A
    2.0 cm
    B
    0.5 cm
    C
    4.0 cm
    D
    1.0 cm

  • A proton describes a circular path of radius 5 cm in a transerve magnetic field. If the speed of the proton is doubled, then the radius of the circular path will be

    A
    `5 cm`
    B
    `7.5 cm`
    C
    `10 cm`
    D
    `2.5 cm`

  • Electrons accelerated by a potential differnece V enter a uniform magnetic field of flux density B at right angles to the field. They describe a circular path of radius 'r' . If now 'V' is doubled and B is also doubled, the radius of the new circular path is

    A
    `4r`
    B
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    C
    `2sqrt(2r)`
    D
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