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Shows a circular wire-loop of radius a m carrying a current I, placed in a perpendicualr matgnetic field B. (a) Consider a small part dl of the wire. Find the force on this part of the wire exerted by the magnetic field. Find the force of compression in the wire.

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(a) Force an part of length `dl` of wire`=iBdl`
(b)`2Tsin (d theta)/2=iBdl`
`2Tsin (d theta)/2=iBdl`
`T=iBa`
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