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A 250-turn rectangular coil of length 2....

A 250-turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85`muA` and subjected to a magnetic field of strength 0.85 T.Work done for ratatiing the coil by `180^(@)` against the troque fis

A

`9.1 mu J`

B

`4.55 muJ`

C

`2.3 muJ`

D

`1.15muJ`

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • A circular coil of radius 10 cm having 100 turns carries a current of 3.2 A. The magnetic field at the center of the coil is

    A
    `2.01 xx 10^(-3)T`
    B
    `5.64 xx 10^(-3)T`
    C
    `2.64 xx 10^(-3)T`
    D
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    A
    33 Nm
    B
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    C
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