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A very long bar magnet is placed with it...

A very long bar magnet is placed with its north pole coinciding with the centre of a circular loop carrying an electric current. `i`. The magnetic field due to the magnet at a point on the periphery of the wire is `B`. The radius of the loop is `a`. The force on the wire is

A

Nearly `2 pi a I B` perpendicular to the plane of the wire

B

`2pi a I B` in the plane of the wire

C

`pi aiB` along the axis of the wire

D

zero

Text Solution

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The correct Answer is:
A
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Knowledge Check

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    A
    `((BA)^(2))/(mu_(0)pi)`
    B
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    C
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    D
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