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A circular flexible loop of wire of radi...

A circular flexible loop of wire of radius r carrying a current I is placed in a uniform magnetic field B perpendicular to the plane of the circle, so that wire comes under tension. If B is doubled, then tension in the loop

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`mg+F_(St)=B" "Rightarrow" "mg+4at=a^(2)hrho_(omega)g" "Rightarrow10+4xx(10)/(4)=10h" "or" "h=2m`
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