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If a bar magnet of pole strength 'm' and...

If a bar magnet of pole strength `'m'` and magnetic moment `'M'` is cut equally `5` times parallel to its axis and `4` times perpendicular to its axis then the pole strength and magnetic moment of each piece are respectively

A

`m/20,M/20`

B

`m/4,M/20`

C

`m/5,M/20`

D

`m/5,M/4`

Text Solution

Verified by Experts

The correct Answer is:
C
`m^(1)=m/5,M^(1)=M/(5xx4)`
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Knowledge Check

  • If a bar magnet of pole strength 'm' and magnetic moment 'M' is cut equally 4 times parallel to its axis and 5 times perpendicular to its axis then the pole strength and magnetic moment of each piece are respectively

    A
    `(m)/(20),(M)/(20)`
    B
    `(m)/(4),(M)/(20)`
    C
    `(m)/(5),(M)/(20)`
    D
    `(m)/(5),(M)/(4)`

  • When a bar magnet of pole strength 'm' and magnetic moment 'M' is cut into n equal parts longitudinaly and transversely then pole strength and magnetic moment of each piece is respectively

    A
    `m//n, M//n`
    B
    `m//n, M//n^(2)`
    C
    `m//n^(2), M//n`
    D
    `m//n^(2), M//n^(2)`

  • Two magnets of a magnet is 16 cm . Its pole strength is 250 milli.amp.m . When it is cut into four equal pieces parallel to its axis, The magnetic length, pole strength and moments of each piece are: (respectively)

    A
    `4cm,62.5milli Am,250 milli amp. Cm^(2)`
    B
    `8 cm,500 milli Am,400 milli amp. Cm^(2)`
    C
    `16 cm,250 milli Am,4000milli amp.cm^(2)`
    D
    `16 cm, 62.5 milli Am,0.01 A.m^(2)`

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