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A circular coil of diameter 7cm has 24 t...

A circular coil of diameter `7cm` has 24 turns of wire carrying current of `0.75A`. The magnetic moment of the coil is

A

`6.9xx10^(-2) amp -m^(2)`

B

`2.3xx10^(-2)amp-m^(2)`

C

`10^(-2)amp-m^(2)`

D

`10^(-3)amp-m^(2)`

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • A circular coil of diameter 7 cm has 24 turns of wire, carrying current of 0.75 A. The magnetic moment of the coil is

    A
    `6.9xx10^(-2)A-m^(2)`
    B
    `2.3xx10^(-2)A-m^(2)`
    C
    `10^(-2)A-m^(2)`
    D
    `10^(-3)A-m^(2)`

  • A circular coil of diameter 9 cm has 30 turns of wire which carry current of 1 ampere. The magnetic moment of the coil is

    A
    `19.08 xx 10^(-2)Am^(2)`
    B
    `3.8 xx 10^(-2)Am^(2)`
    C
    `7.7 xx 10^(-3)Am^(2)`
    D
    `3.8 xx 10^(-3)Am^(2)`

  • A circular coil of radius 10 cm "and" 100 turns carries a current 1A. What is the magnetic moment of the coil?

    A
    `3.142xx10^(4) A-m^(2)`
    B
    `10^(4)A-m^(2)`
    C
    `3,142 A-m^(2)`
    D
    `3 A-m^(2)`

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